Vidal struck against his old club for the 2-0 win.
“It's important for me, for the team, it was a very difficult game against the best team in Italy," Vidal told Sky Sport Italia.
“I am glad to have scored my first goal for Inter, very happy. I think we proved today that we are up to the task of challenging for the Scudetto.
“This gives us the confidence to keep pushing, to believe we can win the Scudetto, as we beat the strongest team over the last nine years. We believe that we can go all the way."