Chelsea striker Diego Costa was involved in yet another confrontation on Wednesday as he appeared to strike Aaron Cresswell during his side 's 1-0 win against West Ham . Costa , who was not punished for the incident , has a reputation for trying to unsettle his opponents by throwing his weight around . The 26-year-old striker escaped the attention of Premier League official Andre Marriner , who failed to see the severity of the incident . Chelsea striker Diego Costa appeared to raise his hand in the direction of West Ham 's Aaron Cresswell . Cresswell felt the force of Costa 's right arm during Chelsea 's 1-0 win against the Hammers at Upton Park . Costa tussles with West Ham defender Carl Jenkinson as Jose Mourinho watches on from the sidelines . West Ham boss Sam Allardyce warned his players against trying to provoke or intimidate Costa ahead of the fixture at Upton Park . ' I think trying to wind Costa up only makes him better – which is a silly thing to do , ' said Allardyce . 'He will take a bit of shackling . We ca n't get involved with him . I 've told our central defenders not to get involved with the fact he might try and upset them . 'He 's an old-fashioned type of centre-forward because he seems to like getting motivated on the physical and niggle aspect of it all . I 've told them not to get involved in that and get distracted , simply to focus on him in the final third . ' Meanwhile , Jose Mourinho 's side remain five points clear at the top of the table - with a game in hand - following their win over their London rivals . Chelsea playmaker Eden Hazard scored the only goal of the match to help his side claim all three points .
Chelsea striker Diego Costa was involved in incident with Aaron Cresswell . Referee Andre Marriner did not take action against the West Ham international . Sam Allardyce said there was no point trying to wind up Costa before game . Eden Hazard scored the only goal of the match to give Chelsea the win . CLICK HERE for all the latest Chelsea news .