An injury can always mess things up on "Dancing With the Stars." Now it turns out that Maksim Chmerkovskiy was actually injured on Friday during a rehearsal for the show. Now three days later, the fans are finding out and are worried that Maks might not get to dance tonight.

What happened to Maksim?

Maks and Heather were rehearsing the Jive to Little Mix‘s “Grown” for this week’s episode when he ended up pulling a calf muscle. This doesn't sound like a really serious injury, but Maksim was in a lot of pain after it went down. It is actually so bad that Maksim won't be dancing tonight on the show. He will be sitting this week out, but hopefully, he will be back soon.

It turns out that troupe dancer Alan Bersten will be filling in for Maksim Chmerkovskiy tonight and dancing with Heather Morris. He has filled in on the show before. This will be great because it won't keep her from competing and this way Maks can still work with them on all of the choreography and stuff for this week to make sure Heather gets the votes to stick around another week. There are hopes that Maks will be feeling well enough to come back next week.

There has been some talk about how Maks and Heather might actually have an advantage this season. She was on the show "So You Think You Can Dance, " and she also worked as a backup dancer for Beyonce, but this is a totally different kind of work. Maks even shared his thoughts on it before the season started. Below is what Maks had to say about it.

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"I do care what people say, but I can’t really control what they say. Heather’s excited for the opportunity, and I’m going to be fueling that excitement. I’m not going to be looking at her like ‘you have an advantage. It’s not fair.'”

Are you shocked to hear that Maksim Chmerkovskiy is injured? Do you feel like this could hurt Heather Morris chance at winning the mirror ball trophy? Sound off in the comments section below on your thoughts, and don't miss new episodes of "Dancing With the Stars" on Mondays on ABC. Everyone is going to see if Heather can actually pull off a win this season.