Rocker Dan Reynolds broke his hand in May (13) after punching a drum kit.
The Imagine Dragons frontman was wrapping up a gig when the accident happened, and he was left sporting a protective cast after shattering two bones.
He tells Bbc's Newsbeat, "Eight weeks ago... it was this moment of, 'Ah, I'm going to punch a drum', and I punched it and it broke my hand - I broke two metacarpals in my hand. I just got the cast off recently.
"It's a big concert drum - you would think that when the adrenaline's pumping you can just be like, 'Wham!' and it be fine but I punched it and my hand was like a gummy worm afterwards. It was the last song so I tried to wave goodbye and my hand was a little limp."
The film will be the first in the Marvel Cinematic Universe led by a person of colour.
The actor plays the titular hero in the forthcoming adaptation.
Rock legend Eric Clapton has admitted the era of the guitar may be ''over''.
Following his success with 'The Force Awakens', the director will close out the trilogy.