Vieira's reaction comes after last week's flare-up between Inter teammates Zlatan Ibrahimovic and Marco Materazzi.
Mancini refused to criticise publicly Vieira for his strop last night: "Vieira for me is not a problem. He can go home and cool off. I have to think of other things on the bench. For example in three days we have Roma.
"Sometimes no one thinks when they're on the field. Patrick, among others, was warned and was facing suspension for the next game. Anyway, I like him.
"He had a good match, too good given his current physical condition."
