The New York Knicks are heading back to the NBA Finals for the first time since 1999. But they might have a little less firepower on the bench: Center Mitchell Robinson has reportedly broken his right pinky finger, per multiple reports.

Robinson’s current return timeline is reportedly unclear. It is also unclear how Robinson suffered the injury, though The Athletic reports that he broke his pinky earlier this week.

New York picked up its second-straight sweep of the postseason with a dominant win over the Cleveland Cavaliers on Monday. Robinson played 18 minutes in Game 4, putting up eight points and 10 rebounds off the bench.

Robinson has been a key piece of the Knicks’ second line this season, averaging just under 20 minutes per game, with 5.7 points and 8.8 rebounds per game.