Josh Koscheck and Anthony Johnson have verbally agreed to fight each other at UFC 106 on Nov. 21 in Las Vegas, Sherdog.com has learned from a source close to the bout.

Koscheck announced Tuesday on his Twitter account that he would be fighting Nov. 21 in Las Vegas in a co-main event fight.

“I got some big fight news for me,” he wrote. “I am fighting nov 21 in Vegas. Co main event!!! Haha it's on baby!!!!”

Following Brock Lesnar’s withdrawal from his title defense against Shane Carwin, the scheduled UFC 106 co-main event, Tito Ortiz vs. Forrest Griffin, became the main event. Reports surfaced later that the UFC was looking to bolster the card with a new co-main, and that now appears to be the case with Koscheck-Johnson.

Koscheck stopped Frank Trigg at UFC 103 in September to rebound from an upset loss to Paulo Thiago in February. Sherdog.com’s No. 5-ranked welterweight, he has 11 UFC wins and four losses. Johnson, 8-2, has won three straight in the Octagon. Most recently he stopped Yoshiyuki Yoshida on Oct. 24.

Jeff Sherwood and Greg Savage contributed to this report, which was updated at 2:11 a.m. EST with Johnson as Koscheck's opponent.