Everton manager Roberto Martinez believes Chelsea's Diego Costa still needs to learn how to show his opponents respect following his sizable transfer to the Premier League this summer.
Costa signed for Chelsea from Atletico Madrid for £32 million having inspired Diego Simeone's side to the Spanish title and the final of the Champions League, scoring 36 goals in 52 appearances across all competitions.
He has wasted little time justifying his price tag since the move to Stamford Bridge with four goals in his first three outings, two of which came in the breathless victory against Everton at Goodison Park on Saturday.
Branislav Ivanovic, Nemanja Matic and Ramires also scored for Chelsea in the 6-3 triumph, while Seamus Coleman inadvertently diverted into his own net - and it was the latter that caused some friction between the two sides.
Costa appeared to take great satisfaction from Coleman's mistake, which he made clear to the Everton full-back, resulting in something of a ruckus between the Spain international and opposition goalkeeper Tim Howard.
It was an unedifying incident, and Martinez hopes his compatriot will learn to hold his tongue from now on.
"There are certain foreign players who come to the Premier League who need to understand the ethics and the culture," Martinez said after the game.
"The behaviour in the British game is unique.
"The last thing you want to see is disrespect from a player to another player and I am sure he will learn that very quickly.
"There is a real professionalism and respect in the league so you can understand why the players weren't happy with that, in the same way as trying to buy free-kicks with the way he plays."
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