The Chelsea legend believes he has become a better manager after his problematic stint at West Ham.
He told the Guardian: "I learnt many lessons from some tough experiences. One of the biggest was that no matter what happens you need to hold on to your beliefs. And you must stay humble. During my time away from football I was with Milan and Barcelona during training. The most impressive thing about Barcelona was how humble they all are. The humility of the players and staff was fantastic."