Fulham manager Felix Magath is keen to see a fully fit Kostas Mitroglou as soon as possible.
The Greece international joined the Cottagers from Olympiakos for £12million on deadline day but has managed less than half an hour on the pitch since his arrival in southwest London.
Mitroglou came to Craven Cottage with knee and hamstring problems and although he got through 60 minutes of Greece's 2-0 friendly loss to South Korea on Wednesday night, he is unlikely to be ready to play a full 90 minutes in Saturday's relegation battle with second-bottom Cardiff City.
"He is not match fit," he told reporters. "He played only 60 minutes and has hamstring problems.
"We have to wait. He comes back today [Thursday], our doctor has to see him and maybe if he is fit he will play.
"We need a player in our situation who is prepared for 90 minutes' relegation fight.
"The Premier League is the best league in the world, so it cannot be compared with the Greek League.
"Every player who comes from the Greek League needs a few weeks to adapt.
"You cannot expect such a lot from a player who is new in the Premier League. You have to give him time to adapt. If he's not fit now, he will be fit next week."
