Robert Whittaker and Israel Adesanya will face off in the Octagon at Anaheim's Honda Center on Saturday.
Cormier (22–1, 1 NC) will defend his heavyweight title against Miocic (18–3), who he won it from last summer with a knockout. The loss ended Miocic's streak of winning three straight bouts, but he hasn't fought since facing Cormier.
Saturday night's main card also includes Nate Diaz's (19–11) return after a three-year absence following his rematch loss to Conor McGregor in August 2016. Diaz will face Anthony Pettis (22–8) in the co-main event.
Time: 10 p.m. ET.