United host Everton on Sunday.
De Gea watched in awe as the Everton keeper's athleticism forced extra-time before the Belgians eventually won 2-1.
"Maybe, without him, they might have lost that [Belgium] game four or five-nil. He played really well," De Gea told ManUtd.com. "When you have a game like that, your confidence just gets bigger. You always hope to have games like that.
"He is a really experienced goalkeeper who has played many, many games in the Premier League. He is brave, quick around his goal and a great shot-stopper. He is a great keeper."
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