Liverpool legend Robbie Fowler has told the Liverpool Echo that Jurgen Klopp must not allow his side to sit back and rest on their laurels at Old Trafford despite taking a 2-0 lead into the Europa League second leg.
Goals from Daniel Sturridge and Roberto Firmino gave the Reds a firm advantage in the first leg of the last-16 clash at Anfield last Thursday in the first ever European meeting between the two rivals.
Fowler, who scored 183 goals in 369 matches for the Merseyside club during his career, admitted that taking such a lead to Old Trafford is a dream situation for his former side.
However, the ex-striker insisted that the visitors must not sit back and simply try to defend their lead at Old Trafford, highlighting the fact that 2-0 can be a most dangerous of scorelines.
He told the Echo: "Liverpool are in a great position but I don’t think it’s over yet. If someone had said before the tie that we would have a 2-0 lead to take to Old Trafford then we all would have taken it.
"The massive danger is that you go into the second leg with the mental attitude that ‘we’re 2-0 up, we just need to keep what we’ve got’. But it doesn’t always work like that. There could be a mistake or a set-piece that enables United to pull one back and then the tie is very different.
"You have to treat it the way you would treat a league game at Old Trafford. You have to go there looking to win the game on the night. We have to be on the front foot and looking to score that first goal. If we do that it’s a long way back for United because they’ll need to score four."
Liverpool will be looking to seal the aggregate victory and earn a quarter-final place in a European competition for the first time since 2010, when they reached the Europa League semi-finals only to lose to Atletico Madrid on away goals after extra-time.
Winning the Europa League may be the best chance that either club has to requalify for European competition next season, with Liverpool and United in eighth and sixth place respectively in the Premier League.