He scored 33 goals in his debut season, has five this term, and inspired Spain to European Championship glory. But Torres, 24, said: "I am my own sternest critic, but my manager is just as demanding as I am.
"Rafa keeps reminding me I still have a long way to go. I'll score a goal, but he won't tell me he is happy afterwards - I have him on my back for six hours every day.
"But the fact he paid £26m for me is a huge vote of confidence."