Metamoris 4: Chael Sonnen vs. Andre Galvao, Josh Barnett vs. Dean Lister in the works for Aug. 9 in Los Angeles

Well, this is interesting.

Not long after retiring from mixed martial arts (MMA) -- thanks in part to a failed drug test -- former Ultimate Fighting Championship (UFC) middleweight number one contender, Chael Sonnen, has agreed to face Andre Galvao in the main event of the upcoming Metamoris 4 jiu-jitsu tournament, which is currently scheduled for Aug. 9, 2014 in Los Angeles, California.

Front Row Brian first reported the match up earlier this week.

I guess now is as good a time as any to mention Sonnen's difficulties with Brazilian grapplers, which comprise four of his eight submission losses as a pro fighter. Naturally, things are a bit different in a straight jiu-jitsu match and "The American Gangster" should have a considerable size advantage.

He's going to need it, too, as Galvao has enough grappling gold medals to fill a treasure chest.

Also on tap for the "City of Angels" submission showdown will be current UFC heavyweight and Brazilian Jiu-Jitsu black belt Josh Barnett, as he tries to muscle his way past two-time Abu Dhabi Combat Club (ADCC) champion and former UFC middleweight Dean Lister.

That's according to a report from MMA Fighting.

Thanks to Brendan Schaub's stinker back in 2013, Metamoris is now a submission-only tournament, eliminating the need for points or judges during each 20-minute round. Other names attached to the event are ADCC and UFC veteran Vinny Magalhaes and grappling grand-slammer Keenan Cornelius, in a match that was previously scheduled for Metamoris 3.

The full line up is expected to be announced on Monday.