Thiago (Pitbull) Alves has been forced to pull out of Saturday's UFC 111 welterweight bout against Jon Fitch because of a brain irregularity, according to reports.
UFC president Dana White confirmed the news to media on Thursday morning that an issue appeared during a mandatory pre-fight medical taken by the Brazilian.
"Failed CAT scan. Confirmed by Dana White." tweeted Kevin Iole of Yahoo! Sports.
Alves is coming off a loss to 170-pound title-holder Georges St-Pierre at UFC 100 in July.