Chelsea boss Antonio Conte has defended Diego Costa's demeanour u2012 and joked he 'has to calm himself down before his players'.
Costa, who was fortunate not to be sent off at Stamford Bridge, netted a dramatic last-gasp winner on Monday night.
The striker was booked in the first-half and escaped without another booking in the second period when he caught West Ham keeper Adrian with a reckless challenge.
Conte, speaking ahead of his side's clash at Watford, refused to criticise his striker despite the controversy surrounding their Premier League victory.