Emre Can started for the Reds but despite the impressive victory he underlined aspects that the team must improve.
Can told reporters after the game that Liverpool must press better if they are to reach their potential under Jurgen Klopp.
“The second half was more difficult. At times we didn’t press as well as we should have done,” Can said.
Dortmund were renowned for their intense pressing style under the stewardship of Klopp and the German manager seems keen to implement a similar philosophy at Liverpool.
The Germany international of Turkish origin did however, reveal that he was pleased with the teams first half performance.
“The team played very well. The first half was very good,” he added.
“We created a lot of chances, we scored two goals and kept a clean sheet so we’re happy.”
Can has been one of the Reds most in-form players recently and put in another hard working display against the Red Devils.
The young midfield is expected to start in the return-leg at Old Trafford next Thursday. Can would have progressed to the quarter-final stage of the competition for the first time since joining the Reds.
The 22-year-old also featured in the Liverpool side that was knocked out of the Europa Legaue Round of 32 clash against Besiktas last season.