Carroll told the Daily Express: "I've known him for two years at Olympiakos and he has played at the highest level in the Champions League and scored a lot of goals for us there.
"He has been the top goalscorer in Greece for the last two years. He is 26 and hungry and passionate about his football.
"Eric Cantona was a great, great player, one of the best but Konstantinos is very strong.
"I remember watching Cantona on television and he was holding the ball up and that's the type of player Konstantinos is."
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