Officials may be too scared to do their job properly in the light of Chelsea's allegations against Mark Clattenburg, an ex-referee who was fined for swearing at a player, warned Monday.

"Referees should be as dispassionate as possible but there are times when you do get caught up in the heat of the battle," said Stuart Dougal, who was reprimanded and fined for swearing at Rangers' Christian Nerlinger in 2004.

The Football Association launched an investigation in to Chelsea's ...

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