He added: "Whether they make next year's Champions League or not - and it looks highly unlikely now - they are miles away from being good enough to challenge for the title".
The point means United's hopes of qualifying for next season's Champions League are out of their hands, but De Gea atoned for his earlier mistake with an excellent save to deny Gonzalo Higuain at the death.
Their 1-0 win over Brighton on Tuesday is the only time in the past 10 games involving the four sides that one of them has won. It's great to be there and play against the best players in the world, the best teams.
"You can not say there is any complacency, David is not the type to sit down and be complacent".
Ole Gunnar Solskjaer is, however, expected to oversee a number of comings and goings in the next window.
United had gone ahead through Juan Mata, but Chelsea equalised when de Gea weakly parried Antonio Ruediger's effort into the path of Marcos Alonso, who tucked the ball in.
In the fight for a Champions League spot, fourth-place Chelsea holds a three-point advantage over sixth-place United with two games remaining. But I'm sure we won't see him any more this season unfortunately. He has saved us so many times this season.
His year to forget started at the World Cup in Russian Federation, when De Gea allowed a shot from Cristiano Ronaldo to ricochet off his hand and bobble over the goal line.
The Spanish jeers returned two weeks ago when he allowed a tame shot from Lionel Messi go underneath his body and into the net in a Champions League match at the Camp Nou. "So opponents will want to test him and shoot from distance, just as Ruediger did in the build-up to Alonso's goal". Then came the mistake against Chelsea.
But there was more bad news for United in the form of injuries to Marcus Rashford and Eric Bailly. He only has one year left on his contract and continues to be linked with a move to Real Madrid.
While there has been much talk of Sergio Romero's quality as a back-up keeper, the Argentine has hardly been infallible when he has had a run in the side during his four years at the club.
That's the way to get the best out of David de Gea, and having the best David de Gea is a luxury few clubs could dream of.
United finish the season with games against Huddersfield Town (A) and Cardiff City (H).
Can De Gea bounce back again?