Lyle "Fancy Pants" Beerbohm says he's in for a May 15 bout welcoming Vitor "Shaolin" Ribeiro into Strikeforce.

The bout, first reported as a possibility by MMA Junkie last month, had been in doubt in recent weeks, and last week MMA Fighting's Ariel Helwani was told by sources close to the show that Ribeiro could possibly face Mitsuhiro Ishida in a rematch of their 2004 fight. But it appears the muddied picture is clear to Beerbohm, who says though the bout is not yet officially signed, it has been promised to him.

"I haven't signed a contract, but Strikeforce says I'm 100 percent fighting," Beerbohm told MMA Fighting in an email.

The undefeated Beerbohm has started his career with 13 consecutive victories, and last competed for Strikeforce last June, earning a submission win over Duane "Bang" Ludwig. In his last fight in Sept. 2009, he needed just 89 seconds to earn a TKO win over Josh Martin.

Ribeiro (20-3) returned to MMA in April 2009 after a 19-month absence. In the two fights since his comeback, he earned a TKO win over Katsuhiko Nagata before losing a decision to Shinya Aoki.

Strikeforce: Heavy Artillery takes place at the Scottrade Center in St. Louis, Mo., and features a heavyweight championship main event pitting champion Alistair Overeem against challenger Brett Rogers. In the co-main event, Andrei Arlovski returns to battle Antonio Silva.