Although no official announcement has been made by Strikeforce or either of the two fighters, the report stated that both MMA vets have agreed to the scrap, which will only help solidify an already star-studded cast.

Riggs took a unanimous decision over Diaz at UFC 57 many moons ago. Since that loss, Diaz has gone on to win nine of his last 11 contests, not including his “win” over Takanori Gomi, who was the world’s best lightweight at the time.

Diaz subbed Gomi with a nasty gogoplata, propelling Gomi into his current downward spiral. Days after the upset, Diaz tested positive for being a “Pothead Focker” and the bout was overturned to a No Contest.

Riggs, on the other hand, has gone a mundane 6-4 since his original battle with the Cesar Gracie-trained fighter back in February of 2006. He is riding a two-fight winning streak, with his most recent coming by way of unanimous decision over the controversial Phil Baroni at Strikeforce: Lawler vs. Shields earlier this month.

Strikeforce: Carano vs. Cyborg will take place inside the HP Pavilion in San Jose, California. Here is the list of fighters rumored to be competing in the Showtime broadcast:

Erin Toughill vs. TBD
Roger Gracie vs. TBD
Alistair Overeem (Strikeforce Heavyweight Champion) vs. Brett Rogers *
Nick Diaz vs. Joe Riggs *
Gilbert Melendez vs. Josh Thomson (Strikeforce Lightweight Champion)
Cristiane “Cyborg” Santos vs. Gina Carano (Open Strikeforce Womens Title)

* Not confirmed