There's been alarm expressed after the way Juve were beaten by Inter Milan on Sunday.
But Mancini says, “It's normal to have problems at the beginning. Even if you have top players, coaching is not like playing. It's normal, one improves slowly."
He also stated: “It was a nice game and I was happy to see Barella scoring. It's a nice victory for Inter.
“Juventus can play a bad game once in a while, it happens in football."