Romelu Lukaku admits Manchester United will find it more difficult to stage a successful Champions League comeback against Barcelona than the one they managed against Paris Saint-Germain.
United booked their place in the Champions League quarter-finals with a remarkable 3-1 victory over PSG last month and were rewarded with a tricky tie against Barcelona.
But Ole Gunnar Solskjaer's side face another uphill battle after Barca left Old Trafford on Wednesday evening with a 1-0 win following Luke Shaw's own goal in the first half.
United failed to register a shot on target during their clash against the Spanish champions, and Lukaku has stressed that his side need to show significant improvement in the return leg at Camp Nou next week.
'We have to believe and have the desire and more quality than today,' the Belgium striker said. 'Be better on the ball and then you never know what can happen in football.
'I don't think we played with the same arrogance and confidence on the ball (early on). Second half we tried and the first 20 minutes of the second half we were there.
'It's something we have to do for the whole 90 minutes over there and not concede a goal and score early.'
That approach worked well at Paris St Germain last month as United made Champions League history by becoming the first side to progress having lost the first leg at home by two or more goals.
The Parc des Princes triumph was the highlight of a topsy-turvy campaign for the Old Trafford giants, but even during the difficult Jose Mourinho era they managed to seal a last-gasp 2-1 comeback win at Juventus.
Asked if those two matches will play on Barcelona's mind, Lukaku said: 'Yeah, but I don't think they will look at us, we have to look at ourselves, get a result and give our all, run as much as we can.'
Wednesday saw United fail to muster a shot on target for the first time in a Champions League match since 2005, but there was some promising build-up play.
'Definitely (they are beatable),' Lukaku added. 'On the day you can score from one chance and that's what they did today.
'There was a lack of concentration and they scored a goal and from that moment on we tried to control, but I think over there we have to do a better job and stay focused a bit more, we know they have players who make late runs.
'For us we have to go with the desire, be focused and when the chance comes, we have to score.'
United defender Victor Lindelof echoed those sentiments ahead of Tuesday's return leg.
'It is a good team,' he said after the 1-0 home loss.
'They have very good players and right now I am just angry we didn't get a better result. That is football.
'It is different (to PSG). It will be a different game. We have belief in our team that we can do great things and we have shown that before, so we just have to improve a little bit, go down to Barcelona and do our best.'
Crazyman
126
Let's be real. Rashford should have been subbed instead of Lukaku. Rashford wasn't good today. I think Ole knows Lukaku should've finished the game.
ppx668
89
All Man United strikers (Martial, Rashford, Lukaku and Sanchez) = 42 goals Messi = 43goals. All Man United strikers = 16 Assists Messi = 18 Assists Messi is bigger than Man United! 👍💪
cacadeilmo
81
ask messy play at epl, whether he can do like ronaldo did when he play at epl.
Colinkong
77
Should not have subbed Lukaku at all. Instead Young should not have started at all.
Conart
64
This guy Nelson Semedo is not usually recognised but no Manchester united striker or winger could go past him, who else noticed this guys
teebeimy
8
ask messy play at epl, whether he can do like ronaldo did when he play at epl.
what did Ronaldo do in the epl that Messi can't do. Messi has never played epl before buh has more goals against d so called big six English clubs he has faced than Ronaldo. pls check ya facts well.