Vin Diesel had to learn 16 languages for Guardians 2

Vin Diesel poses in the press room at the People's Choice Awards. (AP)
Vin Diesel poses in the press room at the People's Choice Awards. (AP)

Los Angeles - Vin Diesel had to say all of his Guardians of the Galaxy Vol. 2 lines in 16 different languages.

The 49-year-old actor will reprise his role as the voice of Groot in the forthcoming film, and while he is pleased his vocal talents will be heard on the motion picture in numerous countries, he admitted the follow up movie has been more "challenging" as a result.

He said: "I know that, on the first one, I, like, recorded six different languages, and now James Gunn wants to increase the number of languages we do this in.

"So, every ADR-ed line, every moment in the movie I have to do like 15, 16 times in different languages - which are cool because, you know, it means that my voice is being heard in countries where that's not always the case, even with big movies that you do, like xXx or Fast (& Furious).

"It's usually voice actors in respective markets that say your lines and that's not necessarily what the character is always.

"So, I love that, but it definitely makes it that much more challenging."

At the end of the first Guardians movie, which was released in 2014, Diesel's character Groot sacrificed himself and became Baby Groot, and the actor admitted it is quite different voicing a younger character.

He added to Collider: "Yeah, there is a difference. He couldn't be more naive as Baby Groot. I always think of the Groot that we saw on the first Guardians as a college-level Groot, so he's not fully grown yet, but he's a man.

"And once he sacrifices himself at the end of the movie, now he has to start all over, so to speak, but we're gonna see this goofy, adorable, baby Groot thing running around the screen and just learning as he goes."