Dancing With the Stars fan favorite Derek Hough's injuries are apparently very "serious," according to his sister, Julianne Hough.

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Derek had an incident on Monday in which he broke a toe and sprained his ankle, casting the rest of the season in doubt for the pro dancer. He is currently in recovery in Los Angeles.

Julianne spoke with E! News this week to update fans on his recovery, saying that things aren't exactly looking good.

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"It is serious," Julianne said. "I know that he broke his toe on his right foot and sprained his ankle in two different places on his left foot trying to get ice for the toe."

As for his overall spirits, he obviously still wants to be on the show regardless.

"He's super-bummed out because he's super-passionate about what he does and he wants to be there for his partner," Julianne said.

Derek said in a new Instagram post that the incident wasn't even in regard to dancing itself. He said that, "a fluke accident happened that involved a light and some stairs. Can't believe it, wish I had a cooler story to tell."

However, he said that ultimately he is "determined to come back" and be there for his partner, Nastia Liukin.

 Performing 10 shows a week at Radio City while rehearsing with Nastia for DWTS, I've never felt more healthy,strong and fit. But then a fluke accident happened that involved a light and some stairs. Can't believe it, wish I had a cooler story to tell. All that dancing , flipping , jumping and the thing that stops me in my tracks is something as simple as a light and some stairs . I'm doing everything I possibly can to have a quick recovery and I'm determined to come back stronger than ever. I appreciate all the love and support, you guys are the best. And thank you to Mark, BC Jean and Corky Ballas for staying with me at the hospital until 2am. Love you . This is new territory for me , I'm usually able to work through injury but this one has literally floored me. But like I said before I'm determined to come back all guns blazing ... soon!!! #setbackisasetupforacomeback

A photo posted by Derek Hough (@derekhough) on Apr 22, 2015 at 12:21pm PDT

In the mean time, Liukin is rehearsing with pro dancer Sasha Farber. It is currently unknown if Hough will be able to return at any point this season or if he will be sidelined for the the final weeks of the competition.

Dancing With the Stars airs Mondays at 8 p.m. ET/PT on ABC.

Watch Liukin and Hough's latest dance here:

Tags: Dancing with the Stars Reality TV ABC