The Ivorian netted 157 times for the Blues during eight decorated seasons in west London which culminated in the 2012 Champions League victory.
The 35-year-old striker said: "Stamford Bridge is my house. I could score there even with my eyes closed.
"I left the club on a high and I think the supporters really loved what I did.
"I really enjoyed the time that I spent there and loved them and I still do.
"But now I am Galatasaray player and can give everything for this team."
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