Koscheck recently mentioned Diaz, Demian Maia, Jake Ellenberger and Rory MacDonald as targeted opponents for 2013.
Now, he said he's taking up Diaz trainer Cesar Gracie's challenge for the contenders to meet at the UFC's Super Bowl weekend show, which is expected to be UFC 157 on Feb. 2 at Mandalay Bay Events Center in Las Vegas.
"I am DOWN! Don't be scared Homie! #559 lol," Koscheck tweeted.
Diaz, though, isn't technically eligible to return from a suspension and apply for a fight license until Feb. 4.
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