Massimiliano Allegri: Juventus must score in Borussia Dortmund second leg

A 2-1 win in the first leg means that if Juve keep a clean sheet in Dortmund, they will reach the quarterfinals for the second time in three years.

A 1-0 win for the home team would see the Serie A champions eliminated though, which is why Allegri is intent on trying to get at least one away goal.

"We've got to get this game right under every aspect and I cannot see it ending 0-0 -- we've got to score goals," he said at a news conference in Dortmund. "We've got to play well technically, get as little wrong as possible and exploit their weaknesses."

Allegri would not elaborate on what he believes Dortmund's weaknesses are, but he did touch on the strengths his side will be facing up to at the Westfalenstadion, saying: "They're very quick and they put you under pressure. We know all about them."

What Allegri does not yet know is whether a three-man defence with the returning Andrea Barzagli -- Bundesliga winner with Wolfsburg in 2009 -- or a back four will be the best way to keep BVB's forwards in check.

"I've got to decide by tomorrow," said Allegri, who seems to be leaning towards three at the back with Giorgio Chiellini and Leonardo Bonucci making up the numbers.

"Nothing really changes, just the way we line up. Barzagli's in great shape. He played a great game against Palermo. We've got a player back who we've missed and it's fundamental to have him back."

Reaching the quarters is not fundamental, on the other hand, with Juve president Andrea Agnelli saying that Juve's season does not depend on this one game. The Bianconeri have a 14-point cushion at the top of Serie A and can therefore focus all of their efforts on advancing in Europe.

"I'm pleased with what Agnelli said because one game cannot define a season," Allegri said. "We've been doing a good job so far and now we're onto the final straight. We want to go through and see what comes next.

"The league's not won yet and we've still got a game in the Coppa Italia in which we have the chance to turn the tie around, but first we have to get through tomorrow night."

Juventus will find almost 70,000 fans against them, but that does not faze Gianluigi Buffon, who triumphed in the same venue with Italy over hosts Germany in the 2006 World Cup semifinal.

"Like I've said before, fans cannot score goals," Buffon said. "Certainly the fans here live for these games and it's something the home team feels, and it could be an extra weapon for them, but it could also give their guests more motivation too.

"Playing in a temple where we've already been protagonists is something which always gives you enthusiasm and emotion."