The Brokeback Mountain star spent five months training to play a boxer in the film, and the former welterweight kickboxer, who helped with his conditioning, was left impressed by his work ethic, attitude and talent in the ring.

Buglione tells TMZ.com, "Without a doubt he could compete. The time he put into the role, the way he transformed his body. It was incredible.

"He started training months before the thing even started. By the time we got into it he'd picked up angles, knew how to move and pivot, and sit on his punches."

Gyllenhaal picked up a few more tips while seated ringside at the Manny Pacquiao/Floyd Mayweather, Jr. fight in Las Vegas on Saturday night (02May15).