The Reds boss said: "Most teams in the world would want Luis Suarez. I think Aguero is a wonderful player as well but I wouldn't swap Suarez for anyone.
"I get the chance to work with him every day and what he gives is a relentless desire.
"When you have that, you don't want to let him go. It hasn't always been smooth sailing of course but it never is.
"We have a strong relationship. He is a very humble man. There has been a lot said about him but beneath it all he is a real good guy who is a true professional.
"His will and desire oversteps the mark the odd time, which has got him in trouble, but if you are talking about tactical and technical ability he is up there with the world's best and he is a brilliant player to have."
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