Pep Guardiola said his Barcelona team will need to score at least two goals at the Camp Nou next week if they are to oust AC Milan and reach the Champions League semi-finals.
The Italian and Spanish champions played out a 0-0 draw at the San Siro on Wednesday, leaving next week's quarter-final second leg finely poised.
And having failed to snatch an away goal to take back to Catalunya, the Spaniards' boss is worried that one goal at home will not be enough.
"I think we have to score more than one to go through and we'll try to do that," he said.
"Scoring away gives you a lot, but they were lucky because they didn't even get one free-kick around the box or a corner.
"They're a very strong team and I imagine one goal won't be enough.
"The (Nou Camp) pitch will be better, it will be faster and I hope we'll play well."
Although they failed to score, Guardiola insisted that a draw away from home is a good result.
"At the beginning of the season if you had offered me a Champions League quarter-final with a 0-0 draw away I would have signed for it, and even more so against Milan," he said.
Milan coach Massimiliano ALlegri said his side now have a slightly better chance of going through than they did before the match.
"I'm satisfied because the lads played well, they interpreted the game as they did," he said.
"We pressed them high up the pitch and defended well in our half.
"The result gives us the knowledge that we're going to Barcelona (still in with a chance), we have a difficult match ahead of us but we know we can get two results from three (a win or a draw).
Meanwhile, goals from Mario Gomez and Arjen Robben gave Bayern Munich a 2-0 win at Marseille in their quarter-final first leg, but Jupp Heynckes, the Bayern coach, said he was taking nothing for granted.
"There is a return leg to come first," he said. "There are 90 more minutes against Marseille first, so we can't talk about the semi-finals yet, let alone potential opponents. "It's not that I have doubts - I just respect our opponents. I have a lot of experience in football and I know that these matches are decided over both legs."