A.J. McKee will not get an opportunity to prove his worth against a former champion at Bellator 205 next month.

Pat Curran (23-7 MMA, 13-4 BMMA) has suffered an undisclosed injury and is unable to compete against McKee (11-0 MMA, 11-0 BMMA) in the Bellator 205 headliner, which takes place Sept. 21 at CenturyLink Arena in Boise, Idaho, and airs on Paramount following prelims streamed on MMAjunkie.

MMAjunkie confirmed Curran’s withdrawal from the event with a Bellator official. The promotion is actively seeking a replacement to fight McKee in the main event.

McKee, 23, is currently riding the longest winning streak in Bellator history. He’s won 11 consecutive fights under the organization’s banner against increasingly difficult competition. “The Mercenary” is coming off a unanimous-decision win over Justin Lawrence at Bellator 197 in April and was set for his toughest test to date against Curran, who has held Bellator’s 145-pound title on two separate occasions.

The nature behind Curran’s injury and withdrawal from Bellator 205 are unknown at this time.

The latest Bellator 205 card now includes:

Main card (9 p.m. ET, Paramount)

A.J. McKee vs. TBA Rafael Lovato Jr. vs. John Salter Patricky Freire vs. Goiti Yamauchi Veta Arteaga vs. Denise Kielholtz

Preliminary card (7 p.m. ET, MMAjunkie)

Kyle Frost vs. David Rangel Joe Aguirre vs. Stephen Stirewalt Justin Hugo vs. Vince Morales

For more Bellator 205, check out the MMA Rumors section of the site.