BOSTON (CBS) — The Celtics won Game 3 in Cleveland, but they may have lost a starter.

According to Gary Washburn of The Boston Globe, starting center Amir Johnson is questionable to play in Game 4 on Tuesday due to a sprained shoulder.

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Washburn also reported that Johnson will undergo an MRI on Monday.

Johnson has started nine of the Celtics’ 16 playoff games, after starting 77 of the team’s 82 regular-season games. During the postseason, Johnson is averaging just 2.7 points and 2.1 rebounds in 10.5 minutes on the floor.

WBZ-TV sports producer Joe Giza tweeted a video which shows the play that apparently led to the injury.

The play is notably similar to what Kelly Olynyk did to Kevin Love two years ago in the opening round of the playoffs. Olynyk earned a one-game suspension for that play.