Antonina Shevchenko’s shot at the UFC appears to be in jeopardy.

The older sister of UFC flyweight title challenger Valentina, Shevchenko’s opponent for next week’s Dana White’s Contender Series 11 women’s flyweight bout, Silvana Juarez, has been forced to withdraw, a UFC official told MMAjunkie.

The nature of Silvana’s injury wasn’t disclosed; a replacement is being sought for Shevchenko.

Dana White’s Contender Series 11 takes place June 26 at The Ultimate Fighter Gym in Las Vegas and streams live on UFC Fight Pass. Shevchenko (3-0) vs. Silvana (6-2) was scheduled as the featured headliner on the five-fight lineup.

Shevchenko, 33, is a world champion kickboxing and muay Thai fighter with three professional MMA bouts to her credit. She first competed in MMA in 2005 before fighting twice last year under the Phoenix FC banner. She’s undefeated in MMA, with all three of her wins coming by way of unanimous decision.

The latest Dana White’s Contender Series 11 lineup:

Antonina Shevchenko vs. TBD Te Edwards vs. Austin Tweedy Oscar Cota vs. Greg Rebello Jamall Emmers vs. Julian Erosa Tim Caron vs. Andrew Todhunter

For more on DWCS 11, visit the UFC Rumors section of the site.