He said: "I am going to retire at the end of the season, I'm a little too old to carry on playing so I will take up managing next year. I hope to have the same success as a coach that I did as a player.
"I spent four seasons there and I would love to go back and win something with them. The fans are fantastic there and the atmosphere at Upton Park was always so special.
"Every weekend I watch all the English games on TV but I always look out for the West Ham score, I have a special place for them in my heart.
"When I was there they were really young so I saw them grow up into men and players and I am proud to watch them playing at the top level in the Champions League.