Sherdog’s Andy Cotterill first reported the bout on Tuesday.
Bocek, a TKO and King of the Cage veteran, is 1-2 inside the octagon, dropping matchups with Mac Danzig and Frank Edgar while earning his lone victory over Doug Evans.
Robinson is also 1-2 in the UFC, losing contests to Kenny Florian and Nate Diaz and scoring a unanimous decision victory over Jorge Gurgel.
UFC 91 is headlined by the return of UFC heavyweight champion and hall of famer Randy Couture to the octagon to defend his title against Brock Lesnar in the UFC 91 main event. The rumored card for the pay-per-view event also includes Quinton Jackson vs. Wanderlei Silva, Kenny Florian vs. Joe Stevenson, Demian Maia vs. Nate Quarry, Dustin Hazelett vs. Tamdan McCrory, Nick Catone vs. Amir Sadollah, Gabriel Gonzaga vs. Josh Hendricks, and Jeremy Stephens vs. Rafael dos Anjos.