An injury to former Bellator light heavyweight champion Christian M’Pumbu has forced several changes to the Bellator 99 lineup.

First, the planned featherweight tournament quarterfinal between Patricio Pitbull and Diego Nunes has been moved into the headlining act. The two are competing for $100,000 and a future shot at the belt.

Vladimir Matyushenko, a former UFC competitor, was expected to face M’Pumbu in the main event. Instead, he will meet fellow veteran Houston Alexander at heavyweight.

“It’s an honor to be able to fight for an organization like Bellator,” Alexander said. “I always want to take big fights, and Matyushenko is a guy that’s been around this sport since the beginning, and it will be a huge test. I just want to go out there and smash, do what I do best.”

The card is set for September 13 from California, with the main card airing on Spike TV.