The actor who voices the talking tree in Guardians of the Galaxy let it slip that his Marvel superhero team will sprout up in Avengers: Infinity War.

Vin Diesel teased during a Facebook Live video on Friday that the intergalactic do-gooders will be part of the third Avengers movie.

The Infinity War instalment is expected to unite several Marvel characters from across 18 films.

The Avengers' team is about to get a whole lot bigger. Photo / Supplied
The Avengers' team is about to get a whole lot bigger. Photo / Supplied

Diesel, the star of Fast & Furious, portrayed extraterrestrial Groot in 2014's Guardians of the Galaxy alongside Chris Pratt, Zoe Saldana and Bradley Cooper.

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Diesel called the planned Avengers mash-up "incredibly exciting."

A spokeswoman for Avengers studio Disney did not immediately respond to a request for comment.

Guardians of the Galaxy Vol. 2 is scheduled to launch in May, 2017, while Infinity War is set for release May, 2018.