Torres turned down the chance to play for Arsenal five years ago, after helping Spain win the European Under-19 Championship.
He said: "That's when the offers started to come in.
"I am glad to be in England now, though. And it is my plan to become a legend, one of those players the fans will remember for a long time.
"My main characteristic is willpower. So far I've achieved everything I've wanted and I won't stop."