The Spanish keeper has been linked with Barcelona this season.
"My own form is good and I'm happy. I am at a very good level and the team are also playing very well. We gave our best performance of the season in Leverkusen and showed we are playing well.
"I've always been able to train with a positive mentality and that has allowed me to push forward. I know how to train properly.
"I am very happy at United and want to be here for many years. Yes, I miss the weather and the climate of Spain. It's different in England but you can still live well."
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