Just one week into his retirement from MMA, “The Gangster From West Linn Oregon” Chael P. Sonnen has been booked to compete in the main event of Metamoris 4.

The former UFC middleweight and light-heavyweight title challenger will meet grappling specialist Andre Galvao in the headliner of August’s Metamoris event.

For fans who aren’t aware, Metamoris is a submission only Brazilian Jiu-Jitsu event which allows the best grapplers in the world to face of with each other. The competition has featured many notable MMA fighters, including current UFC heavyweight Brendan Schaub, Dream/One FC champion Shinya Aoki and former Strikeforce champion Renato “Babalu” Sobral.

Sonnen is taking on a huge test in the former Strikeforce welterweight Galvao who is considered by many to be one of the best BJJ guys in the game. The 31-year old is a third degree black belt under jiu-jitsu legend Fernando Augusto and has a lengthy list of accolades to his name.

Galvao has won Gold in the ADCC submission wrestling world championship three times, he’s also took home 11 gold medals in multiple weight divisions in different BJJ tournaments. His MMA record is fairly solid to go with it. The Brazilian is 7-2 in his career with his two losses coming against Tyron Woodley and Jason High.

It’s fair to say Sonnen will be up against it when he makes his Metamoris debut by going up against such a renown grappler. The UFC veteran has been submitted eight times inside the cage but has worked profusely on his jiu-jitsu since he lost his first fight against Anderson Silva in 2010 and hasn’t been subbed since.

Training with BJJ expert Vinny Magalhaes will also give “The American Gangster” the preparation he needs to take on such a formidable opponent in Galvao. Sonnen also has years of wrestling experience under his belt so it will be interesting to see how the two match up.

Metamoris 4 is expected to take place in Los Angeles, California on August 9. The viewing details for the event are yet to be announced but stay tuned to LowKick for more updates on the card.