Inter raided Juve for Zlatan Ibrahimovic and Patrick Vieira last summer and ahead of today's return to Turin, Mancini said: "Alessandro del Piero and his teammates are playing in a great team, one of the most important in the world.
"They suffered one thing in which, as players, they had nothing to do with. In those times there are those who decide to leave, and have every right to, and those who think it is right to stay because they've been there for many years.
"I do not know if the team is now stronger. I believe that Juventus, and I said this at the start of the league, will fight with us and with other teams until the end for the championship. And I say this because, unlike teams like us, Roma and AC Milan, they do not have Europe and can prepare during the week for the championship.
"This can be an added advantage especially as they are an excellent team."