According to UFC co-owner Lorenzo Fertitta, former UFC heavyweight champions Frank Mir (16-5 MMA, 14-5 UFC) and Cain Velasquez (9-1 MMA, 7-1 UFC) are on a collision course, while familiar foes and former light heavyweight champs Forrest Griffin (18-7 MMA, 9-5 UFC) and Tito Ortiz are in line for a trilogy bout.

Fertitta revealed the planned matchups overnight via Twitter.

No date for either fight was revealed.

Mir currently boasts a three-fight win streak that includes a gruesome submission win over Antonio Rodrigo Nogueira at this past December's UFC 140 event. Mir's run also includes a May 2011 decision win over Roy Nelson, as well as a September 2010 knockout of Mirko "Cro Cop" Filipovic.

Mir, who won the UFC's heavyweight title in 2004 before a motorcycle accident forced him to vacate the belt, also won an interim title in 2008. He's 7-2 in his past nine fights, but both losses have come to wrestling stylists in the form of Shane Carwin and Brock Lesnar.

Meanwhile, Velasquez looks to rebound from a November loss, in which he surrendered the UFC title to Junior Dos Santos at the UFC's first-ever FOX-televised event. The defeat was the first of Velasquez's career, a run that included nine-straight wins to open his career, including seven fights in the octagon.

More about this RUMOR at mmajunkie.com