Sources have indicated that a knee injury could be to blame for Mir’s withdrawal. It’s unknown whether a replacement for Mir has been found.
Mir was set to be the first active UFC fighter to cross over to Strikeforce. His matchup with Cormier materialized after fellow ex-UFC champ Tim Sylvia was nixed for a potential headliner with the Strikeforce heavyweight grand prix champion.
In his most recent appearance, Mir replaced Alistair Overeem to fight UFC heavyweight champ Junior Dos Santos at UFC 146 and lost via second-round TKO.
It was his second failed bid to regain the undisputed belt after a motorcycle accident forced him to relinquish the title he won at UFC 48.
The broken leg he sustained kept him out of action for nearly two years.
The undefeated Cormier most recently outpointed Josh Barnett to win the Strikeforce heavyweight grand prix after entering the eight-man tournament in the semifinals as an alternate.
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