Jurgen Klopp has claimed that overturning a deficit against Juventus is one of the biggest challenges his Borussia Dortmund side could face in the Champions League.
A 2-1 defeat in Turin last month means that Dortmund head into the second leg of the last-16 tie on the back foot, and Klopp believes that the defensive ability of their opponents will make the evening difficult.
"To reach the quarter-final you have to put in one outstanding performance," the Dortmund boss told reporters. "We did not have one of those in the first leg.
"We face one of the biggest challenges in football - to win against an Italian side who only need a draw.
"If you have to lose away from home, you want to lose 2-1 so we are still in a good position. It is up to us."
Dortmund are looking to reach the least eight for the third season in a row.
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