He said: "If we can win this competition with the squad we have, it will be great. But I have to think about the Champions League and the Premiership first. We must use all the players we have to succeed."
"We need all the players we have at this moment. Our squad is not big enough to use all our first-team players all the time," he added.
Liverpool face Tottenham Hostpur in the Cup on Wednesday night, at White Hart Lane.