Promotion officials announced the change on Saturday. Sullivan was notified of a potential anti-doping violation earlier this week and was removed from UFC 208 as a result. The event takes place at the Barclays Center in Brooklyn and is headlined by a bout between Holly Holm and Germaine de Randamie for the inaugural women’s featherweight title.
A former Titan Fighting Championships welterweight titlist, Muhammad has dropped two of his first three UFC bouts. The Chicago native last appeared at UFC 205, where he suffered a first-round knockout loss at the hands of Vicente Luque.
Brown has won three of his four Octagon appearances and enters the matchup on the strength of back-to-back triumphs against Brian Camozzi and Erick Montano.