Goals from Sadio Mane, Daniel Sturridge, Sheyi Ojo and a stunner from Xherdan Shaqiri earned the Reds a comfortable victory over Jose Mourinho's men as they completed their International Champions Cup schedule at the so-called "Big House".
The Liverpool Echo say that the Reds have not reignited their interest in Nabil Fekir and with the transfer deadline looming, time is running out to close a deal.
"I know the ones that are not always ready - sometimes you need them and you don't have them".
While I'd say Barcelona's hijacking of AS Roma's deal for Malcom has to take the cake as the most freakish transfer saga of the summer, Liverpool's pursuit of Fekir is right up there. "I think I am not going to get two", Mourinho told reporters.
"This is not our team, this is not our squad".
"If it is possible, good, if it is not possible we keep fighting and working and believing in the players that we have".
The World Cup has hampered United's preparations and Mourinho - who has been visibly downbeat amid the club's struggles to deliver new signings - has now lost key midfielder Matic through injury.
"We are not playing here to improve the team or the dynamic, we are playing here to just survive and have some not very ugly results".
Antonio Valencia will also miss the start of the season after picking up an injury in the goalless draw with San Jose Earthquakes and Mourinho added: "I think too much holiday for him". That is another thing, but this is not even 30 per cent of my squad, so don't look at this that way. The people there decided the beach is better than this, so the stadium was empty.
Pereira won the battle to take a free-kick left of centre, 25 yards from goal, and he beat Kamil Grabara with a sensational strike that rattled into the rookie goalkeeper's top-right corner.
"The referees, they come by mistake". They were called by the baseball federation and thought it was a baseball game, they arrived here and it was soccer!