The Spaniard looked edgy in his first season in England and was hammered by many for not being up to the job.
He said: "If I am honest, yes (the criticism was unfair).
"I was very young and I had arrived at a new club from another country.
"I was learning a whole new language, I was adapting to a new style of football and new team-mates. That's a lot to take in and it's natural that it will take a little bit of time to settle.
"It wasn't easy hearing this criticism but I tried to use it to motivate me and make me stronger.
"I think I have improved as a goalkeeper because of it, actually.
"I like to think that from bad things you can derive good results."
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