Fulham boss Roy Hodgson admits his big-money strikers Andy Johnson and Bobby Zamora are now on trial.
Hodgson said: "They are both players who can score goals at Premier League level.
"But, having said that, I know they are not happy with what they have achieved over the last four or five games.
"They need to produce as soon as possible because time runs out on you.
"They are working hard in training to improve their scoring but they would not expect me to sing their praises for what has happened so far because they know they have a lot more to give."