Everton manager Marco Silva criticised star signing Richarlison for a "naive" retaliation that earned him a red card in the 2-2 draw at Bournemouth.
The Brazilian winger, scorer of three goals in his first two Premier League appearances after joining from Watford, was dismissed shortly before half-time for making minor contact in a headbutt on Adam Smith.
Richarlison's reaction appeared to be sparked by comments from Smith that led to a heated exchange but Silva dismissed provocation as a possible excuse for the 21-year-old's actions.
"It is naive, it is something Richarlison cannot do," the Toffees boss said.