From WENN.com

The Old School star was playing for the Rest of the World team in a celebrity charity game at Manchester United's hallowed Old Trafford stadium when he suffered a match-ending injury.

He recalls, ""They said, 'Just run around, hit the ball and have some laughs,' but everyone there has played semi-professional soccer.

""I popped my hamstring... and I literally had to hobble off the field... I had to walk the length of the field to get into the training room, and I thought the coach would be like, 'I'm so sorry, I should have taken you out,' but he was the former coach of Liverpool... and his comment to me was like, 'Hey Will, when I saw you hobbling off the field I was wondering if you were gonna audition for one of your Hollywood cowboy movies,' and then just had a huge laugh and just walked away.

""I don't know if I'm ever gonna walk again at that moment.""