Two old foes are set to meet at Metamoris later this year.

Chael Sonnen will meet Renato "Babalu" Sobral on May 9 at Metamoris VI, according to Sonnen. Metamoris founder Ralek Gracie confirmed the news, as well. Gracie said the event would take place in Los Angeles, but he would not confirm the location just yet. Gracie added that Sonnen vs. Sobral will not serve as the main event, which will be announced in the coming days.

Metamoris is a grappling promotion that features 20-minute, submission-only matches. There are no points given so a winner is only declared if there is a submission.

Sonnen made his promotional debut in August when he was submitted by Andre Galvao at Metamoris IV. Sobral competed at Metamoris III last March, fighting to a draw against former UFC veteran Dean Lister.

Sobral spoke about his desire to compete against Sonnen on Friday with MMA Prime.

"Babalu" spoiled Sonnen's UFC debut in 2005, when he submitted "The American Gangster" via second-round arm-triangle choke at UFC 55. The pair first met at an event called Hitman 3 in 2003, where Sonnen defeated the Brazilian via decision.