And former Red Devils defender Gary Neville believes the stopper needs to recuperate after a turbulent campaign.
United took an early lead at Old Trafford through Juan Mata against their rivals for Champions League qualification.
But with half-time approaching, De Gea fumbled a relatively tame long-range shot from Antonio Rudiger.
As he tried to recover the loose ball, Marcos Alonso arrived first and lifted the ball over him to equalise.
De Gea looked shell-shocked by his error, the latest in a string high-profile mistakes he has made.
The 28-year-old had been almost untouchable prior to the current campaign, winning United’s Player of the Year award in four of the last five seasons.
And Neville symptahised with his plight, drawing on personal experiance to offer the Spaniard some words of advice.
“I remember I had a nightmare time towards the end of the 1999/2000 season and I just needed the summer,” he said on Sky Sports.
“He needs the summer, he needs to clear his head, get away from football, reset.
“It’s so difficult for him at the moment.”
Former Arsenal boss Arsene Wenger thinks De Gea’s confidence has been drained by conceding so many goals.
“To me it looks like he has lost confidence,” he told BeIn Sports.
“De Gea was never quite a good cross taker but on his line he was unbeatable.
“I remember last year when we played against them we had 33 shots on goal, he made 15 saves.
“But recently he’s not completely, mentally as sharp as he was before.
“It looks to me like when he concedes a goal he thinks ‘I should have done better there’ and in every game he goes down in confidence.”