Roy Makaay is convinced Leeds' hopes of Champions League glory will be wrecked by Valencia.
The Deportivo La Coruna striker witnessed at first hand the strengths and weaknesses of David O'Leary's side.
And though the Yorkshire side ended his own hopes of cup glory with a 3-2 aggregate win, the Dutchman believes Valencia will not make the same mistake.
"I thought we played a great game and deserved to score more goals," said Makaay.
"They had a great keeper. He certainly saved them, and with a bit of luck we could have scored four or five goals.
"They certainly panicked a bit when we scored the first goal inside the opening 10 minutes and they must have thought 'what happens here?'
"That is why if they are to reach the final they have to play better away from home. Leeds are very strong at home, but not away.
"It's all about the form on the day, but Leeds need to play better than that or they will go out. If you put them under pressure you see how they crack."