The Red Devils fell sort of a pack of cards ahead of their home fans as they allowed the visitors to require control of the sport from start to complete.
Naby Keita grabbed the opener within the fifth minute and Diogo Jota doubled the lead eight minutes later. Mohamed Salah then went home with the match ball after scoring a hat-trick as he further compounded United's woes.
After the match, the Spaniard could only describe their performance with some words per UK Mirror.
De Gea later took to Instagram admitting that their performance was below standard, adding that they have to do more for the fans.
Meanwhile, despite starting the season on a high, Ole Gunnar Solakjser and his players are now seventh on the Premier League log with 14 points after nine rounds of top-flight games.
Their next outing are a visit to London to require on Tottenham Hotspur, who are equally enduring a disappointing run of leads to the recent round of fixtures.
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