The Celtics went into buyout season yesterday with a cautious outlook.

Danny Ainge said he’s not in a hurry to fill the team’s vacant roster spot freed up with the trade of Jabari Bird and cash to Atlanta.

At issue is an already packed rotation. The Celtics are not looking for a player, whatever the position, who will command 20-plus minutes a night, such as the just-released Markieff Morris — the twin brother of Marcus, and someone the Celtics forward surmised Thursday night will be looking for a substantial role wherever he plays. Multiple reports have the Lakers showing significant interest.

“We don’t know yet,” Ainge said. “We want to see who else is going to get bought out. But it all depends on the player and the timing. We have one player (Aron Baynes) who is hurt right now and will be back soon. Right now the rest of the team is healthy.”

The Celtics president has an interesting dilemma when looking at the buyout market — the availability of someone who can fit in better than any of the nine players already commanding regular minutes in Brad Stevens’ rotation.

“It’s not an easy task to get the right person,” Ainge said. “A couple who have been bought out we don’t have interest in, and a lot also depends on how someone is going to accept a role.”

Everyone from Jayson Tatum to Kyrie Irving expressed relief Thursday night that the trade deadline passed without affecting the lineup.

“The deadline was a lot for a lot of other people I’m assuming,” Irving said. “For us, we were pretty set. They made that very clear, our management. So I’m just happy that now we can just focus on the rest of the season and have some fun doing so. I’m just glad it’s past.”

Ever since Irving pulled back from his stated desire to season ticket-holders to sign a new max deal with the Celtics this summer, the team has gone on the clock with their All-Star guard as he mulls his next step.

He had expressed disappointment in the product earlier this season, and the immature ways of the Celtics’ younger generation in particular.

Ainge likened the team’s relationship with Irving to an engagement during a radio appearance yesterday, and later told the Herald he has not approached the guard about his recent comments.

Instead, the team now appears to be in the position of proving to Irving that it will be worth his while to stick around.

“We’re just trying to do the best we can, and that’s to win,” said Ainge, who admits he was caught off-guard when Irving made his announcement to season ticket-holders last October.

“Yeah, I was kind of surprised by that,” Ainge said. “Not surprised that he liked it here, but surprised that he would say that to the fans.”

But Ainge also believes the Celtics are showing improvement now, and are equipped to take on the three rivals that added significant talent before the trade deadline — Toronto (Marc Gasol), Milwaukee (Nicola Mirotic) and Philadelphia (Tobias Harris).

“We’ll see. It’s hard to know for sure how it will be,” Ainge said. “I feel very good about what we have. The team has played well in the last 35 games, and we can make another big leap if we continue to build continuity.

“It takes some teams longer to jell,” he said. “But over the last 35 games we’ve had the second best offense in the NBA. There’s always frustrations in a season. It’s a long grind.”