Ole Gunnar Solskjaer is confident his Manchester United side can overturn a 1-0 deficit at Barcelona after losing their Champions League quarter-final first-leg tie on Wednesday.
Luke Shaw's own goal in the first half was enough to hand Barcelona victory at Old Trafford.
United failed to record a single shot on target at home, and though Solskjaer admitted that is a "disappointment", the United boss believes his side can get a positive result at the Nou Camp next Tuesday.
"We played a good team. We know you have to defend a lot without the ball and you might be tired when you get the chance yourself. We go there with one thing in my mind, we have to score," he told BT Sport.
"We did as well as we could against Messi, kept our shape well. It could have gone both ways. I don't think we hit the target and that's a disappointment. We go there with work to be done but chances.
"We're playing against a great team. It's a tough one, we'll go there with the knowledge we can score over there."
Scott McTonimany was arguably United's best player on Wednesday, and Solskjaer sounded the midfielder out for praise after watching his side recover from a "sloppy" start.
Solskjaer added: "Scott McTominay was fantastic. Every time he plays for us he is improving. He's a great athlete, wins his challenges and quick on his feet. He started settling us to be fair.
"Plusses and negatives. We started sloppy and a bit nervous. After their goal we settled and played well.
"We had very good individual performances in midfield. At times it felt like a proper Man United team, the crowd were behind us, we got out wide and got crosses in.
"We didn't start great, but great goal and movement from Messi and Suarez but they're fortunate it comes off Luke Shaw. It's a blow but we settled well. We're still in this tie."