One of the four remaining pro dancers on Dancing With the Stars may not be able to perform Monday night.

Ariana Grande, Iggy Azalea, Amber Riley Performing In DWTS Finale?

Mark Ballas, who has made the finals with his celebrity partner Candace Cameron Bure, may not be capable of dancing with her on Monday's episode. The pro dancer injured his shoulder during rehearsal and he was rushed to the hospital.

"Mark was seriously injured during camera blocking," a source close to the show told People. "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."

Meryl Davis In Danger Of Elimination on DWTS Despite Frontrunner Status?

He injured himself while practicing a move that involved Ballas lifting Cameron Bure onto his shoulders.

The report claims that fellow pro dancers Derek Hough and Cheryl Burke were at the location and recommended that he sit out of Monday night's performance show, though Ballas was insistent on performing anyway.

In the case of Ballas not being able to perform Monday, there will be a replacement dancer who will learn all of the techniques of Cameron Bure's upcoming dances before the show.

This has been a particularly dangerous season of Dancing With the Stars, injury-wise. Billy Dee Williams injured his back during the first few weeks of competition and was forced to withdraw. Danica McKellar suffered a broken rib but she danced on anyway, ultimately placing in sixth. Amy Purdy, who is still in the competition, had a rib go out of place, but she also danced on.

Dancing With the Stars Season 18 concludes Monday and Tuesday at 8 p.m. on ABC.

Watch all four remaining dancing celebrities here:

Tags: Dancing with the Stars Reality TV ABC