Frank Shamrock (Pictures)'s next speaking engagement will be in primetime.

The former UFC middleweight champion will sit cageside to help call the action at EliteXC's "Primetime" on May 31 at 9 p.m. EST, live from the Prudential Center in Newark, N.J.

CBS and EliteXC are expected to make the announcement this morning at a news conference held at CBS Studios in Los Angeles. Mixed martial arts commentator Mauro Ranallo, as well as Gus Johnson, a regular fixture of NBA and NFL broadcasts for CBS Sports, will round out the historic trio.

Johnson is also an anchor of the Madison Square Garden Network's "SportsDesk," where he has provided commentary for the New York Golden Gloves boxing tournaments. Vancouver native Ranallo has covered EliteXC and ShoXC: Elite Challenger Series events since their 2006 inception.

Johnson will give the play-by-play while Ranallo and Shamrock offer color commentary.

Shamrock, who broke his arm during a March 29 loss to Cung Le (Pictures) at a co-promoted Strikeforce-EliteXC event, has commentated shows for the UFC and Strikeforce.