Vicente del Bosque has told his Real Madrid players their dreams of Champions League glory will be shattered unless they are on top form in tonight's semi-final second leg.
He warned the return leg against bitter rivals Barcelona could turn from a dream into a nightmare.
Real will line up at the Bernabeu for 'The Game of the Century - Part Two' already holding a 2-0 lead from the first leg at the Nou Camp.
But as far Del Bosque is concerned, the final on May 15 at Hampden Park in Glasgow might as well be light years away.
"All I can say is we got a result we all dreamed of in Barcelona. Now we are playing at home and we are clear favourites.
"But Barca have some excellent players so we will have to be totally serious about the game if we want to get to the final.
"We have played Barcelona three times this season and have defeated them twice and drawn once. I think that shows our superiority, but anything can happen."
Madrid captain Fernando Hierro stoked up the fires with a reference to the intense rivalry between the two titans of Spanish football.
"Knocking Barcelona out of the Champions League is very important for us, it's always important to beat them," he said.
But the Spain international will not settle for the draw which will be enough to get them into the final.
"Winning will really please the fans and we will go all out to win the game," he said.
"We have an important lead from the first leg and we know how to manage it."
Del Bosque has made two changes to the squad of 18 who returned home in triumph a week ago.
Former Barca star Luis Figo is back from suspension in place of Cameroon international Geremi, while 19-year-old striker Javier Portillo has received a surprise call-up because of injuries.
Portillo, who has netted an astonishing 43 goals for Madrid's B and C teams this season, scored on his Champions League debut against Panathinaikos in the last game of the second group stage.
Del Bosque said: "Portillo is in the squad because Savio and (Fernando) Morientes are both injured and we can't look at the bench and not have a striker there."
Ivan Helguera will continue in defence, while centre-back Francisco Pavon will drop to the bench, with Del Bosque adopting an attacking 4-4-2 formation.