Tevez arrived in the summer from Manchester City.
"I was genuinely surprised," he told Tuttosport. "I thought it was easier to play here, but instead it is more tactical, fast and a lot more hard work.
"It is the most difficult League in which I have played.
"It seems that every team who comes up against Juventus treats it like a World Cup final. Everyone wants to beat us - so we always have to give 100 per cent. It's incredibly difficult.
"But Juve have given me my desire to play football. That is the best thing for a player - being happy. And I am here."
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