Johnny Walker’s younger brother, Valter Walker, has joined him in the UFC.
The octagon debut of the 25-year-old heavyweight is set for Sept. 23 against Jake Collier, multiple people with knowledge of the situation told MMA Fighting following a report by Laerte Vianna.
The UFC has yet to announce the headlining attraction for the Fight Night event, which takes place at UFC APEX in Las Vegas.
Walker (11-0) beat Alex Nicholson via fourth-round stoppage to claim the Titan FC heavyweight championship earlier this month. It was the seventh finish of his undefeated professional MMA career.
Collier (13-9) enters the cage looking to snap a three-fight skid in bouts against Andrei Arlovski, Chris Barnett and Martin Buday. Collier, who started his UFC career as a middleweight in 2014 and now fights at heavyweight, has won five of 13 so far since joining the company.
Damon Martin contributed to this report.
