A light-heavyweight contest between UFC veterans Cyrille Diabate and Anthony Perosh has been unofficially added to the fight card of UFC 138. While the match has not been announced by promotion officials, Diabate broke the news via his Twitter account on Thursday.
training for my upcoming UFC fight @ UFC 138. Anthony Perosh vs Cyrille Diabate. Grappler vs Striker. Classic !!!less than a minute ago via web 
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Cyrille Diabaté
CyrilleDiabate
A former kickboxer, Diabate compiled an 32-8-2 record over an extended professional career that stretched through 2005. Since transferring to MMA full time, the 37-year-old has won 11 of his last 13 bouts, including a first round knockout of Luiz Cane in his UFC debut.
He squares off against Perosh, a second degree Brazilian Jiu Jitsu black belt from Australia. Known as "The Hippo", the 39-year-old submission specialist carried a 0-3 record over two heavyweight stints in the UFC, until dropping down to 205 pounds and defeating Tom Blackledge in the opening minutes of their February bout via rear-naked choke.
UFC 138 is scheduled for November 5th at the LG Arena in Birmingham, England. The event is headlined by a middleweight contest between Chris "The Crippler" Leben and Mark Munoz.
The updated fight card for UFC 138:
Middleweight: Chris Leben vs. Mark Munoz
Bantamweight: Brad Pickett vs. Renan Barao
Welterweight: Thiago Alves vs. Papy Abedi
Lightweight: Paul Taylor vs. Anthony Njokuani
Welterweight: John Hathaway vs. Pascal Krauss
Lightweight: Terry Etim vs. Edward Faaloloto
Featherweight: Jason Young vs. Michihiro Omigawa
Bantamweight: Vaughan Lee vs. Chris Cariaso
Welterweight: Mark Scanlon vs. James Head
Heavyweight: Philip De Fries vs. Oli Thompson*
Welterweight: Chris Cope vs. Che Mills*
Light Heavyweight: Anthony Perosh vs. Cyrille Diabate*
*unconfirmed