Former refs chief Keith Hackett feels Chelsea boss Antonio Conte should bring in an expert to stop their rash of dismissals.

Brazilian defender David Luiz was shown a straight red for a dangerous challenge on Arsenal wing-back Saed Kolasinac late on in their 0-0 draw at Stamford Bridge, becoming the fifth Chelsea player to be sent off since the two sides met in last season's FA Cup Final.

In his Daily Telegraph column, Hackett wrote: “After having five players sent off in their last eight matches, Chelsea need to get someone in from the Professional Games Match Officials Limited or even David Elleray, the International Football Association Board's technical director, to talk to the manager and the players over what is and is not acceptable when challenging for the ball.

"Those five red cards are not the fault of referees.

“It is down to the failure of players to recognise what is acceptable in the game of football."