Magath admitted he is unsure whether £12million record signing Mitroglou will be fit because of a hamstring issue picked up on international duty with Greece.
He said: "Why should I spoil him in a game like Chelsea? Chelsea is the best defending team in the league. He will not get many chances so why should I spoil him in such a game because he is new and needs confidence. It is not good for him or us if he goes in a game and gets no chances."
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