He said: "I know it sounds stupid but I probably get even more joy playing now than I did when I was at Chelsea.
"When I was out of the game for 18 months I realised what I was missing. The best time of my career - as far as playing for the team I loved and the biggest club - was Chelsea. But it kind of passed me by as far as me not taking in what was going on.
"But when I was out of the game I read up on things like the best preparation. Now I'd say I've got a good few years left in me."