Sir Alex Ferguson, in the eyes of many, is the greatest manager to ever live. His success and honours, first at Aberdeen, then Manchester United , across several decades go before him. But what about those who learned from him? There's plenty who claim that a manager's legacy is in part down to how they influence those around them. Johan Cruyff to Pep Guardiola an obvious example. The Manchester City boss has seen a number of those close to him - Mikel Arteta and Xabi Alonso - since go on to