Former heavyweight champion Mike Tyson has revealed that he was high on cocaine while filming his cameo appearance in Hollywood blockbuster The Hangover.

The 46-year-old played himself in the movie, which was released in 2010, and the ex-boxer has expressed his gratitude to the producers for allowing him back to film a cameo for The Hangover 2.

"I was a mess," Tyson told Yahoo! Sports. "I was overweight. I was a pig, high on cocaine. They had to know I was messed up. I couldn't talk. I had the cocaine talk.

"So those guys are just beautiful people. They had my back, and I appreciate that and stuff, then they asked me to come back [in The Hangover 2]."

Tyson was convicted in 2007 for being found in possession of cocaine.