UFC 203 will be held in Cleveland, where hometown hero Stipe Miocic defends his UFC heavyweight title for the first time against Alistair Overeem. In the co-main event, Fabricio Werdum will take on Ben Rothwell.
Punk, 37, birth name Phil Brooks, signed with the UFC in December 2014 and had his debut postponed because of a shoulder injury. He has been training at Roufusport Academy in Milwaukee, the home to former UFC lightweight champion Anthony Pettis and Asia-based ONE welterweight champion Ben Askren, among others.
Gall (2-0) is a 24-year-old welterweight prospect fighting out of New Brunswick, New Jersey. He made his UFC debut on Feb. 6 and picked up a first-round submission win.
CM Punk to make September UFC debut
ESPN MMA editor Brian Campbell discusses what is at stake for CM Punk at UFC 203.