The former UFC lightweight champion is injured and out of a co-main event fight with Myles Jury at UFC on FOX 16 on July 25 in Chicago, it was reported Thursday night on FOX Sports 1.
Edson Barboza will step in and face Jury, though that fight will not be the co-headliner. UFC senior vice president of public relations Dave Sholler told MMAFighting.com that a women's bantamweight title eliminator between Miesha Tate and Jessica Eye will slide into that co-main event role at United Center.
Pettis (18-3) just lost the lightweight title to Rafael dos Anjos at UFC 185 in March.