Manchester United legend Edwin van der Sar believes goalkeeper David de Gea was the key component in the club's Premier League title-winning campaign last season.
The former Holland international won four league titles during his six years between the sticks at Old Trafford, and has said that De Gea has coped well since becoming his replacement.
Spaniard De Gea became the most expensive goalkeeper ever at the tender age of 20, after his move from Atletico Madrid to Manchester in 2011.
And Ajax's current marketing director, Van der Sar, has said the youngster dealt superbly with the pressure and transition.
"It is unbelievable," said Van der Sar to Sky Sports. "He came from different league, he was young. He was 20 when he came.
"He came from Spain, he didn't speak the language. There is different food, different tactics, different methods of training.
"Corners and free-kicks, balls in the box - that is different to the Spanish league. It was normal he could have some troubles in the beginning.
"I think the way he turned the corner from January onwards has been a real benefit for United and one of the two or three reasons they won the league.
"His physique is better. He worked really well with (former goalkeeping coach) Eric Steele and the physical coaches and that is the way you improve.
"He is still so young but already experienced. Hopefully he will get a chance in the national team also."
Despite a rocky start to his career at former European champions Manchester United, De Gea has shown he has the ability to become one of the world's best goalkeepers.
His form this season has been one of the only positives for a struggling United side, as David Moyes looks to prove he can handle the pressure of succeeding Sir Alex Ferguson.
The only concern for De Gea will be his unexpected exclusion from the Spain squad for their 2014 World Cup qualifiers this week.
With the likes of Barcelona's Victor Valdes, Real Madrid's Iker Casillas and Napoli's on loan star Pepe Reina, all vying with the United stopper for a place in Vicente del Bosque's World Cup squad, it will be a tough task to break into the world class Spain set sup.
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