Brock Lesnar's Next UFC Fight Off?

Yahoo!'s Kevin Iole is reporting that Alistair Overeem may have pulled out of the UFC 141 main event set for December 30 for family reasons. In his place is expected to be Frank Mir who defeated Antonio Rodrigo Nogueira at UFC 140. Frank Mir would fight Brock Lesnar in their third fight since 2008, with each man holding a win over the other. At the post fight press conference, Dana White denied that Overeem was injured.

UPDATE: In an update to the story, ESPN's Joss Gross has posted the following on Twitter, regarding the fight possibly being off?

"White denies Overeem is off the Lesnar card. But Alistair is on Mon.'s NSAC agenda. I've heard possibly in connection w/ prefight drug test."