De Gea appeared sharp and back to his best at Wembley as he produced several vital saves to help Spain to a 2-1 win.
"I've never had any doubts over De Gea," Luis Enrique told reporters afterwards.
"He may have made some mistakes like everyone else, but we have one of the best in the world.
"I'm very calm about him, he's a top level player, something he has shown in this game and throughout his years in England.
"Going by numbers and performances, he is world's number one."