ACB confirmed the fight with MMA Fighting on Wednesday.
“One Punch” announced his return to action to last month having bid an emotional farewell to fans when he retired at UFC London in March, 2017.
Pickett (25-14-0) hung up his gloves after suffering three consecutive defeats in the Octagon to Iuri Alcantara, Urijah Faber and most recently, Marlon Vera. He claimed his last win at UFC London in 2016 when he edged a split decision in his bantamweight clash with Francisco Rivera Jr.
The legendary British campaigner’s most notable win is his unanimous decision nod over pound-for-pound great and UFC flyweight champion, Demetrious Johnson, at WEC 48.
Brock (23-9-0) has a professional record that spans back to 2006 and he has competed across a number of promotions including Bellator, WSOF and RFA. In his last outing, Brock handed Noah Ali the third loss of his career at Front Street Fights 12 to get back in the win column.
Brock shares a common opponent with Pickett. He met “Mighty Mouse” in his fledgling professional years at Alaska Fight Championship. Brock lost the 2010 bout via TKO.
In the main event of ACB 91, Albert Duraev defends his middleweight crown against Piotr Strus.