“I can’t slate the man," West Ham's Michail Antonio told The Footballer's Football Podcast. “I don’t really want to slate the man. But De Gea has got to do better.
“I don’t understand, he is such a good 'keeper. But he has these moments, I feel so bad for the guy.
"He was up there as one of the best 'keepers in the world, even though he is up there, he still has these crazy moments.
“That goal, it was so slow. When I saw the shot I thought, ‘he is just going to collect this’.”
De Gea was beaten too easily by Said Benrahma's weak shot which turned out to be the winning goal.
David Moyes' side held on to the 1-0 lead which leaves Erik ten Hag's men looking over their shoulder in the quest for Champions League qualification.
The mistake has raised further questions about his suitability to be United's first-choice goalkeeper next season.