According to reports, Magomed Ankalaev refused to pull out of his rematch against Alex Pereira and fought with a major injury.

The UFC has officially announced the UFC 321 pay-per-view fight card. Two title fights sit atop the fight card, which has an early start time.

Date: Oct. 4 | Location: T-Mobile Arena -- Las Vegas Early prelims begin at 6 p.m. ET and can be seen on FX/ESPN+ Televised prelims begin at 8 pm. ET and can been seen on FX/ESPN+ Main card begins at 10 p.m. ET Watch live: ESPN+ PPV | Price: $79.99

Khamzat Chimaev laid down a challenge to Alex Pereira following the Brazilian's impressive TKO victory over Magomed Ankalaev at UFC 320 on Saturday.

Usman (11-4 MMA, 4-2 UFC), brother of former welterweight champion Kamaru, has been ruled out of his heavyweight clash against Valter Walker (14-1 MMA, 3-1 UFC) at Saturday's UFC Fight Night 261, which takes place at Farmasi Arena in Rio de Janeiro, Brazil. The news was confirmed by MMA Junkie on Thursday following a report by Laerte Viana.

Sidey (12-2) enters the contest on a two-fight win streak. After losing his UFC debut to Ramon Taveras — the man he beat on the Contender Series to earn a contract in September 2023 — Sidey earned a pair of a decision victories against Garrett Armfield and Cameron Smotherman.