Footballers are a superstitious bunch and many within the game subscribe to certain customs or routines in order to, as they see it, keep the bad luck at bay.
Laurent Blanc famously made a habit of kissing Fabien Barthez's head during France's successful World Cup campaign in 1998, for example, while the legendary Johan Cruyff used to slap Gert Bals on the stomach before each game, following that up with the ritual of spitting his chewing gum onto the opposition's half.
As weird and varied as footballers' superstitions already are, however, not many involve best-selling musicians.