When Thomas did, Ainge quickly revealed that he had traded Thomas to the Cavaliers in a package for Kyrie Irving .

Thomas described the call in a first-person account in The Players’ Tribune. He had just celebrated his one-year wedding anniversary and Ainge had texted him to give him a call as soon as possible.

It was the toughest call Danny Ainge has ever had to make as a general manager, reaching out to Isaiah Thomas , who had given so much to the Celtics, to tell him that he had been traded.

Ainge told the Globe this past week that it was beyond difficult to make the deal and make the phone call to Thomas, who was one of his favorites.


Thomas, meanwhile, said in The Players’ Tribune that he was “hurt” by the trade.

“I will just simply say that I thought Isaiah did a fabulous job in that article,” said Ainge. “He was honest and he shared the feelings that he had in that. It was a really tough thing for everybody.

“I feel for players. I’ve been a player. I’ve been traded and I understand it, and I thought the writing he did was superb.”

Related: As questions linger about his hip, Isaiah Thomas recalls tough Boston exit

Ainge said he wouldn’t get into the details of the deal, which was delayed by the Cavaliers’ concern over Thomas’s hip injury and their request for more compensation.

“It was definitely the toughest call I ever had to make,” Ainge said. “It’s in everybody’s best interest that I don’t share all the reasons [for the trade]. But the bottom line is obviously I felt like it was the right thing for our franchise to do. But it’s a deep and complicated process. It’s not as simple as people think it is.


“And again, being a player in professional sports for 18 years and being traded twice and signing as a free agent once and playing on championship teams and being a coach in this league and being an executive for as long as I have, I think I’ve got a pretty good grasp on all of the emotions and I have a pretty good understanding how real this all is involving players and their lives and their families and the disruptions and the emotions. I get all that and that’s not easy for players and for coaches and for executives that invest a lot into these players.

Jim Davis/Globe Staff/File 2016/Globe Staff

“It’s not easy for these office people that become great friends with the players. There’s a reality that I see and that’s what makes any sort of trade challenging. But it’s just part of the world that we live in, but it’s got to be done. You’ve got to do what’s best for the franchise. The franchise is bigger than all of us. Bigger than one individual.”

It was a summer of change for the Celtics. They will begin training camp with 11 new players, and most of the core that helped them reach last season’s Eastern Conference finals is gone.

And the team also did not renew the contracts of longtime trainer Ed Lacerte and popular strength and conditioning coach Bryan Doo.

“Not just Isaiah, but Jae [Crowder], Avery [Bradley], and Kelly Olynyk,” Ainge said. “All those guys. And Eddie and B-Doo. I consider all those people my friends and the part of it where being the person who makes those decisions and these are my friends and they probably don’t think that I think much of them anymore. I’ve been traded and not working with [friends] anymore is the hard part of it when I’m grateful for every one of those people and all they’ve done for the entire franchise.”


Despite the changes, and the difficulty in making moves involving popular players and team employees, Ainge said he is optimistic and excited about the future, especially with the acquisitions of Irving and Gordon Hayward.

“I’m getting very energized again, it’s that time of year,” Ainge said. “The kids are coming back to school and it’s fun. It’s not always fun [to make these moves]. It’s not always clear sailing. It’s not always easy. It’s real life and Isaiah, I thought, did a really good job of describing from his perspective that real life.”

Ainge also touched on trading Paul Pierce and Kevin Garnett to the Nets four years ago.

Pierce had played 15 years in Boston and Garnett became very popular in his six years as a Celtics. Both wanted to retire in Boston.

“I would have been thrilled to let Paul and KG finish their careers as Boston Celtics and have then finish here,” Ainge said. “I would have been fine with that. But we had an opportunity that came up that presented itself that we needed to do for the benefit of our fans, our franchise. It’s not my franchise. It’s not Paul’s franchise. It’s the city of Boston’s franchise and that’s my job to do what I think is best for the franchise. With ownership we work to make decisions that’s best for the long-term benefit of our franchise.”


UNUSUAL ASPECTS

Altman was put on spot by trade

Tyronn Lue, Koby Altman, Isaiah Thomas, Jae Crowder, and Ante Zizic posed for photos at an introductory news conference last week. Jason Miller/Getty Images

The Cavaliers made the best of a difficult situation when they traded Kyrie Irving to the Celtics. They were able to procure Isaiah Thomas, Jae Crowder, Ante Zizic, the Nets’ first-round pick in 2018, and the Heat’s second-round pick in 2020. It was an admirable haul, but the circumstances of the deal were bizarre for Cleveland general manager Koby Altman, who inherited the job soon after Irving made his trade demand.

Shortly after the Cavaliers’ loss in the Finals, Irving had a private meeting with team ownership and asked to be traded.

The request then became public and Altman had to figure out whether Irving was indeed serious about wanting to move on.

“I think we were in information-collecting mode when stuff first broke,” Altman said at Thursday’s news conference introducing the new additions. “We had numerous teams call about it. Just taking a step back relative to Kyrie, I want to thank him from the organization. He made tremendous contributions to this franchise and this city. He was here six years and he became a champion here and he helped us win a championship in spectacular fashion. And so I think we owe him a thank you and we owe him a debt of gratitude and we’ll always be thankful for his exciting years with the Cavaliers and I wanted to be sure Kyrie heard that from us.


“Relative to the trade, we’re just excited about today and moving forward, about the players that are on this stand and how they’re going to help us. Coach [Tyronn] Lue talked about the acquisitions we made in the offseason, how they’re going to help us. The goal remains the same, winning a championship, and we think the guys are going to help us a great deal with that.”

Lue had remained mum on the situation until this past week. Privately, Irving said he didn’t particularly enjoy playing for Lue, or his role in the offense.

Lue moves forward with more depth at forward in Crowder, but also the uncertainty with Thomas and his hip.

“Kyrie was a big part of what we did, and like Koby said probably making the biggest shot in Cleveland history and being one of the biggest shots in NBA Finals history and he was a big part of what we did,” Lue said. “Just like to say thanks to him for what he’s done. Now my thing is we have to move forward and we have to get this team ready to jell together, be on the same page and one common goal: winning a championship. I think the guys we have here and the guys Koby assembled for our team, I think we have a great chance of doing that.”

Altman with Thomas, who will be out for at least the first few weeks of the season. Tony Dejak/AP

The Cavaliers didn’t exactly make a splash in free agency. They signed well-traveled and underachieving forward Jeff Green to a one-year deal and brought in grizzled guard Jose Calderon. The club also brought over former second-round pick Cedi Osman from Turkey.

With Thomas out for at least the first few weeks of the season and likely beyond, the Cavaliers will have to find ways to remain competitive in the Eastern Conference.

They aren’t getting any younger with Derrick Rose (28), Kevin Love (29), LeBron James (32), J.R. Smith (32), and Richard Jefferson (37) playing key roles.

“I’m just very excited for what we have,” Lue said. “It’s going to be different without Kyrie as far as to start, a guy who can go one-on-one and get his shot off at any time. But from another standpoint we will be able to change our offense a little bit and do things a little different and I’m very excited about that opportunity, very excited about that challenge.

“Once we get everyone back and get everyone healthy I know we are going to be a great team.”

ETC.

League is a hub of social activity

The NBA continued to show why it is unquestionably the most progressive league in American pro sports as commissioner Adam Silver and NBPA executive director Michele Roberts sent out a joint statement encouraging the players to be socially active and speak freely.

Silver said he follows all the league’s happenings via social media.

“I have an account on all the different platforms,” Silver said. “I don’t choose to tweet other than on the official NBA account. So I have to have an account to follow what’s going on.”

The NBA’s official Twitter account has 26.4 million followers. The NFL’s Twitter account has 24 million followers. Major League Baseball has 7.7 million followers on its official account. The UFC’s Twitter account has 6.21 million followers.

“And as to why we’re so popular in social media, one reason is we embraced it, we embraced it early on,” Silver said. “We went out to our players and encouraged them to actively participate in social media. We helped them authenticate their accounts early on so people would know it was them. But I also think there’s something special about basketball. I think it’s the way our players are acculturated from a very young age as their growing up.

“Think about it, they’re in their shorts and T-shirts, fans even at a young age are right up against the court, even at a young level. I feel like they’re fully exposed. They don’t have helmets. They don’t have hats. There’s nothing hiding them. They’re not in dugouts between innings, and because our players play offense and defense, people feel like they know them because they see them on the floor so much.

“And so much credit goes to our players. They’ve embraced it. They are like a lot of young people of their generation. They enjoy being on social media. I think it demonstrates how multidimensional they are. I think it’s all come together in a cool way for the league.”

Layups

The Bucks held a tryout for free agents this past week and former Celtics first-round picks James Young and R.J. Hunter took part. Afterward, the Bucks signed Young to a training camp contract. The Celtics did not re-sign Young, the 17th overall pick in the 2014 draft, after last season and he played for the Pelicans’ summer league team (averaging 8.5 points and shooting 39.5 percent from the field in six games in Las Vegas). The Bucks will have 18 players in camp and have two players signed to two-way contracts, so it’s likely Young is headed back to the G-League. Hunter played for the Trail Blazers during summer league and they tried him at point guard, where he wasn’t effective. Hunter, a first-round pick of the Celtics in 2015, is still seeking a training camp invite . . . After a three-year absence, Rod Higgins has returned to an NBA front office as a college scout for the Hawks. Higgins was president of basketball operations for the Bobcats/Hornets before he was removed by Michael Jordan and replaced by Rich Cho. The Hawks are rebuilding after trading Dwight Howard and allowing Paul Millsap to sign with the Nuggets. What’s more, the Hawks’ third-highest-paid player is Jamal Crawford, who is with the Timberwolves. Crawford went to Atlanta in the Millsap sign-and-trade and was bought out by the Hawks before signing with Minnesota.

Tilman Fertitta purchased the Rockets for a record $2.2 billion. Wayne Parry/AP/File 2012

The sale of the Rockets went smoothly as casino/hotel magnate Tilman Fertitta purchased the franchise from Leslie Alexander for a record $2.2 billion, eclipsing the $2 billion Steve Ballmer paid for the Clippers. The NBA and NBPA just agreed to a new collective bargaining agreement that began July 1. With the rising values of franchises, how does the league keep former players engaged in pursuing ownership? “One of the ways we can keep [former players involved] is to bring them in as partners in terms,” Silver said. “So there’s more of a path to where Michael Jordan is as the principal owner. Recently Grant Hill came in as a major investor [with the Hawks] and it wasn’t a symbolic investment. It was a major investment. David Robinson has been a longtime investor in San Antonio. Shaquille O’Neal in Sacramento. Penny Hardaway in Memphis. We’re encouraging more teams to bring in former players as partners. That’s part of the path to ownership. I don’t want to artificially hold prices down for any potential buyer, but there are other paths to being potential owners and we’re seeing that right now. Compared to any other league probably in the world, we have more former players who are actually equity partners in our teams.” . . . The Bulls acquired swingman Quincy Pondexter from the Pelicans in a salary dump. Chicago also picked up a 2018 second-round pick in the trade. The Bulls have the lowest payroll in the NBA, while the Pelicans were looking to avoid the luxury tax.

Gary Washburn can be reached at gwashburn@globe.com. Follow him on Twitter @GwashburnGlobe.