Striker Diego Costa should focus on his football and ignore whatever the media writes about his behaviour, manager Antonio Conte said.
Recent reports have claimed that the Spain international was lucky to avoid red in Chelsea's first two Premier League games of the season.
But the Italian has urged the 27-year-old to "stay positive" and to focus on scoring goals and winning games for his team.
"Diego must be focusing on the game," he told the club's official website.
"I don't understand other players, managers or the press that talk bad about him. He must stay very positive on the match because for me the game and the performance are the most important things.
"It is important to pay attention during the game – only this – because he is an important player and he can score a lot of goals and I want him to put himself in the game and not seek other situations.
"[The Watford win?] Usually when my team play I play with them, I try in every moment to suggest the right pass or the right position.
"This is important because sometimes when the ball is off on one side it's important to shout to change side, for example, or at the end of the game when we played 4-2-4 I had to shout to stay very wide with the two wingers, which is not easy. It's important to support the players."