Luke Shaw own goal gives Barcelona slight advantage going into second leg United rallied after that early setback and unsettled Ernesto Valverde"s side MANCHESTER: Romelu Lukaku called on Manchester United to play with "arrogance and confidence" against Barcelona as they seek to overturn a 1-0 defeat in the first leg of their Champions League quarter-final. Ole Gunnar Solskjaer"s side face an uphill battle at the Camp Nou next week after Luke Shaw"s own goal gave Barca a 1-0 win in Wednesday"s match at Old Trafford. United rallied after that early setback and unsettled Ernesto Valverde"s side, giving Lukaku and his teammates confidence of a memorable turnaround in Spain next Tuesday. "We have to believe and have the desire and more quality than today," said the Belgium striker. "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 Saint-Germain last month as United made Champions League history by becoming the first side to progress after losing 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."