Mark Ballas was injured during a rehearsal Sunday and may not be able to perform on Monday night's finale of Dancing With the Stars, a show spokesperson confirms to E! News.
The injury happened while Ballas was rehearsing his freestyle routine with celebrity partner Candace Cameron Bure, according to People, which originally reported the story.
"Mark was seriously injured during camera blocking," a spokesperson told the magazine.
"His shoulder popped out during a lift and he was taken by ambulance to the hospital where he was treated and released. It's unclear whether or not he'll be able to perform on Monday's show."
The series is currently in season 18.