Liverpool manager Rafa Benitez insists he can make 'no promises' as to when Harry Kewell will be given his next chance to impress.
Kewell, who made his first appearance for the Reds this season against Cardiff in the Carling Cup on Wednesday, is out of contract at the end of the season and is keen to justify a new deal.
The winger has struggled with groin, foot, knee and thigh problems over the past two seasons and his outing against Cardiff was his first since Liverpool's UEFA Champions League defeat to Milan in May.
Kewell needs first-team action in order to earn new terms at Anfield, but Benitez says he will not be making any special compensations.
The Australian looks set to miss out on Liverpool's Premier League clash with Blackburn on Saturday, but Benitez has hinted Kewell could be given an opportunity against Besiktas in the Champions League on Tuesday.
"Harry will need time, the problem is that when you have important games and only 16 players to select, it is difficult for him," said Benitez.
"But at least he has played and scored for the reserves, playing only until half-time, and then he had a 20-minute spell against Cardiff.
"He is now training with the senior players, but it is not easy to say when we will use him in the future. Maybe for a European match when I can name 18 players, that might be the time.
"But we have other players also coming back from injury and we cannot field a weakened squad.
"I can make no promises, he will have to wait for the opportunity to come along."