He said: "The message for my players who are not in the side regularly is that they must always be ready. They could well be needed for the Champions League.
"I always use the example of Vladimir Smicer. He was not in the team and only on the bench in Istanbul.
"But he was always ready and he came on to score a very important goal in that final with AC Milan.
"He is fit, and yes there is a contract issue. But if he scores goals and plays well then the whole thing will be easier to resolve in the long term."