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Hoek has followed new manager Louis van Gaal to Old Trafford, replacing Chris Woods as goalkeeping coach at the Premier League club.
Though, the 57-year-old will not arrive in Manchester alongside Van Gaal until the conclusion of the Netherlands' FIFA World Cup campaign in Brazil.
De Gea formed a good relationship with Woods as he was crowned United's Player of the Season, before the coach was relieved of his duties at the end of a dismal campaign.
But former United goalkeeper Van der Sar has first-hand experience with Hoek, who was his first goalkeeping coach at Dutch powerhouses Ajax during the 1990s, and the 43-year-old believes De Gea can become one of the best in the world under Hoek's guidance.
"He groomed me and helped me learn all the things I needed to know to be a successful footballer over a lot of years," Van der Sar said of Hoek, who also worked alongside Van Gaal at Bayern Munich.
"He should be a great help for David. He used to work at Barcelona so he'll speak Spanish, although I know David speaks good English now. I think they'll be a good combination."
Van der Sar added: "Like Louis van Gaal, he's really exact with his exercises. They both put a lot of thought into them.
"He was one of the first guys I know who connected the goalkeepers with defenders and midfielders in terms of exercises.
"It wasn't only about practising kicks as a keeper, he would think about different situations you might be in during a game and try to find exercises and drills for us that he would combine with the outfield players."
