News of the match up was confirmed to MMAmania.com from KO Dynasty's Mickey Dubberly.
Fisher (23-5) hasn't fought since suffering an unanimous decision loss to Joe Stevenson at UFC 104 in October. He was originally slated to face Duane Ludwig at UFC on Versus 1 on March 21, however, he was forced off the event with an undisclosed injury.
Prior to the loss against Stevenson at UFC 104, Fisher won three straight fights against Jeremy Stephens, Shannon Gugerty and Caol Uno. Fisher has put together a 8-4 UFC record since debuting with the promotion in October 2005, scoring other Octagon wins over Aaron Riley, Thiago Alves, Matt Wiman, Dan Lauzon and Sam Stout.
Siver (15-7) is fresh off an unanimous decision loss to Ross Pearson at UFC Fight Night 31 last month. He previously won won four straight fights, which included three consecutive UFC wins over Nate Mohr, Dale Hartt and Paul Kelly.
The event will also feature the middleweight finalists from the 11th season of "The Ultimate Fighter" square off for a six-figure UFC contract.