Not being a footballer player - I don't know, but is pre season training really that bad? also read a similar article in last Monday's Times: http://www.timesonline.co.uk/tol/sport/football/article2013072.ece
I'd hate to think how bad it can be at that level. Even at the low level I played, pre-season training used to have quite a few people throwing up. Nothing to do with beer unfortunately.