Ivanovic uses the full-back on the opposite flank as a reference point.
He said: "For me Ashley (Cole) is the best left-back in the world in the last 10 years. It's a real pleasure to work with him.
"Sometimes it's difficult to learn from him because he's doing everything naturally. There are not a lot of things you can do and be like him.
"For me he always helps as a good reference. When you have him opposite you on the pitch you have to work hard to synchronise with him and we try to do that."
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