The former Villarreal defender has been outstanding for United so far this season.
"Oof, a great signing," said De Gea to the Daily Mail. "Eric's come in and surprised us all very quickly. I remember when I first came to England and, trust me, it can be hard early on but he's flying.
"He is physical, strong, technically confident and super-fast. He only speaks a little English but we have lots of Spaniards in the dressing room and Paul Pogba speaks French of course.
"He's a big presence and when I stand in the tunnel and look behind me, he is one of the new big, powerful players along with Pogba and Zlatan Ibrahimovic that gives us real presence and stature this season."