#6 Carlos Tevez
A word of advice to any young footballers planning to transfer to a rival team without causing a stir, don’t agree to plaster yourself across a billboard sporting your new rival side’s club colours. That’s exactly how Carlos Tevez approached his move to Manchester City after he opted for a move to the Citizens rather than making his two-year loan deal with Manchester United permanent.
The Argentine was adamant at the time that it was not an act of betrayal, stating, "If I play for Manchester City I don't think the United fans will feel I am a traitor. They have to remember that at least as far as I know I have been thrown out of the club and I have to study the best offers available."
Very true but given that United and City have one of the fiercest rivalries in the country and given that the deal came at a time when City were viewed purely as buying their way to success, I doubt such a claim would’ve calmed the anger of any United fans.