BOSTON -- Boston Celtics big man Aron Baynes will return to the starting lineup Monday night after missing one game with a sprained left elbow.

According to Celtics head coach Brad Stevens, Baynes likely aggravated an old injury during Friday night's win against the Detroit Pistons. He was sidelined for the last three-plus quarters of that game plus the following night's victory against the New York Knicks.

"Probably some residual from an injury in the past that got aggravated the other night," Stevens said Monday before hosting the Memphis Grizzlies. "But he feels a lot better today. He's going to start, play. Should be good to go."

With Baynes, the Celtics' usual starting five has outscored opponents by 13.6 points per 100 possessions -- a mark that ranks that group near the top of all high-minute lineups. With Baynes on the court, Boston can suffer offensively, but has posted a lovely 96.5 defensive rating. For reference, that's 4.5 points petter than the Celtics' normal league-best mark.

"I think the biggest thing is he's just a really good team defender," Stevens said. "He made a huge difference. I think he's one of the biggest reasons why our defensive numbers are where they are and he doesn't care if he gets credit for them."

Baynes' return will push Daniel Theis back to the bench, but Stevens had plenty of kind words to say about Theis before the game: