David De Gea believes playing in the Premier League has made him a better goalkeeper, and is relishing working with Victor Valdes at Manchester United.
De Gea, 24, has been one of United's standout performers since the beginning of the 2013-14 season after a difficult start to life at Old Trafford.
The Spanish keeper joined United from Atletico Madrid in 2011, and told FIFA's official website he is benefiting from having to adapt to English football.
"Truth be told, English football has changed me a great deal," he said. "I've developed a lot physically, greatly improved my concentration and generally improved all aspects of my game.
"I was very young when I came here, but four years on, things are very good overall. This league really suits me, as you learn a lot here."
He said he was determined to help the team finish in the top four this season after their poor domestic campaign in 2013-14.
"We have to qualify for the Champions League no matter what," he said. "We already missed out last season, and a team like Manchester United cannot do that two years in a row."
Louis van Gaal signed Victor Valdes on a free in January as a backup to De Gea, and the United No. 1 said he is learning from his 33-year-old compatriot.
"Victor Valdes and I work very well together -- I'm very happy to be with him," he said of the former Barcelona keeper. "I'm learning so much from him, not just in goalkeeping terms given his immense experience, but also as a person.
"He's a very straightforward guy with a lot of character. Moreover, he's always ready to lend a hand, trying to help out with his advice, especially during games."
De Gea's fine form has led to speculation linking him with replacing Iker Casillas for both club and country.
Sources told ESPN FC last week that Real Madrid have taken the first steps in moves that will see Casillas finally leave the club after 18 years, while De Gea has yet to agree a new deal at Old Trafford with his current contract up in the summer of 2016.
However, De Gea says that while he is ready to play for Spain should the opportunity arise, he is aware that Casillas and Bayern Munich's Pepe Reina provide strong competition.
Asked about succeeding Casillas for good, De Gea replied: "For the moment, no. At present there are three of us and Iker [Casillas] remains the first choice.
"You never know what the future holds so you just have to live in the moment, try to train as best you can and take advantage of whatever opportunities the boss gives you. Living in the present is what matters most."
De Gea could start for Spain in Tuesday's friendly against Netherlands, with the goalkeeper saying: "You always want to play against the biggest and best teams. We're heading into the game really determined to win and show we're a very good side."
Not bad, not bad at all. Casillas watches de Gea in this evening's training session in Amsterdam. pic.twitter.com/n9FZDyAsyL
- AS English (@English_AS) March 30, 2015
The 24-year-old was the only member of the Spain's 2014 World Cup squad not to play in Brazil last summer as Vicente de Bosque's side failed to defend their 2010 triumph, but De Gea is determined to succeed with La Roja in the future.
He added: "Thank God I was fortunate enough to be selected for Brazil... Well, the memory is a bittersweet one. I was really excited with it being my first full World Cup, but the result is obviously one to forget.
"On top of that, I injured myself out there. A World Cup can be very difficult. You need to go into it in very good form and play with immense focus. Otherwise, the smallest things could have you on a flight home.
"I want to play at a World Cup and not just go as a squad member. I want to win titles for my club and country as that's what makes a footballer great. I still have so much to do in my career."