Juve will meet Real Madrid in the first-leg tonight.
"I didn't expect a semi-final," Tevez admitted.
"I expected to win the League, and we wanted to fight as much as possible for the Champions League.
"[Coach Max] Allegri, [President Andrea] Agnelli and the entire hierarchy have demonstrated that they are all very serious and want to win the Champions League together.
"I think it will be a very difficult semi-final, I believe it's wide-open, the two games will be very hard-fought and open.
"I don't think it's a semi-final in which there are favourites, whoever makes fewer mistakes will win the game."