The Argentina forward took part in his first training session with the Serie A champions and admits he was not used to such rigorous work in England
The £10 million signing, who joined from Manchester City earlier this summer, is keen to prove to fans that he can up his game in the upcoming Serie A season.
"Well, after my first day of training I realised that I’ll certainly have to run much more than in England," he told reporters.
"Feeling the passion of the fans is important for me. I came here to work hard and it took me just half a session to realise I’ll have to work harder than in England."
Tevez will wear the No.10 shirt for the Serie A champions, previously donned by club legend Alessandro Del Piero, but he stressed that such a prospect is exciting rather than putting him under pressure.
"That doesn’t weight me down," the Argentine, 29, added. "It makes me feel important to receive such affection.
"I have joined a club that are ready to play for an historic third straight Scudetto and one that are also capable of challenging for the Champions League."