This isn’t just football fans though; everyone needs to have their wits about them in touristy places.Unfortunately this seems to be a regular occurrence for travelling fans.
Prior to the Euro League draw I was talking to a Utd friend, who goes on a few trips a season to get some tips on where to avoid, and tips on travelling, and one of the themes that came up was the number of Utd fans who seem to lose/have stolen passports and wallets while overseas.
Given the rain in Amsterdam I wasn't too concerned as all valuables where under several layers of clothing, but in Athens in any crowded area, I was always weary and spent most of the time with my hands firmly in pockets to deter would be thieves.
It's not so much the loss, but the hassle that follows in terms of replacement passport, cancelling bank/credit cards, or these days the loss of mobile.