The upcoming movie, based on the comic book of the same name, follows a group of intergalactic heroes, led by Peter Quill aka Star-Lord, as they are tasked with battling cosmic threats, reported Ace Showbiz.
Earlier this year in August it was announced Hollywood lead man Bradley Cooper was also cast in the film, he is the voice of 'Rocket Raccoon'.
James Gunn, who will direct the movie, posted a photo of Diesel along with a model of the character he will be playing, the caption read, "Vin Diesel is a super awesome dude. I can't tell you how much I like this guy."
There has been talk of the 46 year-old actor joining the project for quite some time now and in July the 'Fast & Furious' star said that he had attended several meetings with Marvel about the role.
He will be joining the cast that includes Chris Pratt as 'Peter Quill/Star-Lord', Zoe Saldana as 'Gamora' and his Riddick co-star Dave Bautista as 'Drax the Destroyer'.