Referees' association says Mark Clattenburg will co-operate with any investigation into his conduct
Referee Mark Clattenburg will co-operate with any investigation into his conduct at Stamford Bridge on Sunday
Last Updated: 29/10/12 3:13pm
Chelsea have accused Clattenberg of using "inappropriate language" towards two of their players during United's 3-2 win and will be making a formal complaint to the FA.
Professional Game Match Officials (PGMO), the body which represents Premier League referees, has released a statement which reads: "PGMO is aware of the allegations and they are being treated with the utmost seriousness.
"Mark will co-operate fully and welcomes the opportunity for the facts to be established.
"No further comment will be made until this matter has been properly investigated."
Clattenburg was at the centre of events on Sunday, sending off Branislav Ivanovic and Fernando Torres with the score at 2-2.
And a Chelsea spokesman said after the game: "We have lodged a complaint to the Premier League match delegate with regard to inappropriate language used by the referee and directed at two of our players in two separate incidents."
John Obi Mikel and Juan Mata are believed to be the players involved in the pair of incidents.
And Clattenburg has been given the backing of the referees' union Prospect.
The organisation released a statement saying: "Prospect is offering full support to Mark Clattenburg in relation to the allegations made against him.
"It is now important that the allegations are fully investigated through the proper process as quickly as possible. We will be making no further comment at this stage."