Mitroglou remains a doubt for Saturday's trip to Cardiff [GETTY]
January signing Mitroglou has played just 30 minutes for the Londoners, but remains a doubt for Saturday's fixture after playing for Greece on Wednesday night.
And Magath claims he needs players who are ready to play full games as his side fight for survival in the Premier League.
"Now he has gone to the national team and he has played 60 minutes. He will come back today but he is not match fit - he has muscle problems now.
"We need a player in our situation that is prepared for 90 minutes. We have a relegation fight.
Kvist only other doubt as Fulham travel to Cardiff [GETTY]
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"Maybe if he is fit he will play on Saturday.
But the Cottagers boss has revealed that the only other doubt for the relegation clash would be Kvist, who played for Denmark against England last night at Wembley.
"Almost every player apart from Kvist - he played 90 minutes last night and has hamstring problems - we have to wait on how he feels.
"But the others are fit and well."
Meanwhile, Jordan Mutch is expected to start for Cardiff after shaking off a hamstring injury.
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