CANTON -- Boston Celtics big man Daniel Theis said he's feeling 100 percent again on Monday, at Celtics media day. Theis tore his meniscus in March, ending his 2017-18 season.

"I feel great," Theis said. "My knee is fully recovered. About training camp, I think it's way easier than last year. Everybody is ahead because you got most of the team back. We can start where we ended the season. Like last year, we had a bunch of new players and we had to start at zero with the philosophy of Coach Stevens. Now, we can go right in there, pick up from last year and just improve."

Theis' injury was overshadowed slightly by the Celtics' higher profile players who missed the postseason, including Kyrie Irving and Gordon Hayward. But Theis was a useful player for the Celtics -- protecting the rim, rebounding, stretching the floor and diving to the rim.

Theis said he finally hit 100 percent recently.

"Probably for a week or two weeks now, when we started playing 5-on-5 and pickup with almost everybody," Theis said. "We had almost our whole team back in early September. It was good for me, Gordon and Kyrie to see where you are at, playing pickup with the whole team."

During the playoffs, Irving, Hayward and Theis often sat together at the end of the bench, watching the young Celtics roll all the way to the Eastern Conference Finals. Theis said sitting out and watching his teammates succeed made him appreciate the game even more.

"You know how much you miss it, just not being able to be on the floor for basketball for such a long time," Theis said. "For everyone coming back from injury this year, with Kyrie, Gordon, you could tell during pickup how much fun everyone was having out there."