Vin Diesel confirms Guardians of the Galaxy role by posing with GrootS

Guardians of the Galaxy director James Gunn put to rest any remaining questions surrounding Vin Diesel's role by posting this picture of Diesel with the tree-like Groot on Facebook. Soon we'll find out how many ways Diesel can say, "I am Groot!"

It's not exactly a surprise that Diesel is voicing Groot (there is even footage of him walking around on tree stilts for his mo-cap performance), but it hasn't been officially announced until now. Gunn posted this image with the following text:

Yep it is completely official. AND he's amazing. I never knew someone could say I AM GROOT so many different ways and with such feeling (and that sounds like I'm kidding but I'm not!)

He also wrote:

Also I hope this puts to rest all the silly Thanos-Vin stuff which people just seemed to make up out of nothing.

Marvel also posted an announcement confirming Diesel's role.