Mark Clattenburg will miss a third week of Premier League matches while the Football Association investigates claims that he used "inappropriate language" towards Chelsea midfielder John Obi Mikel.
The 37-year old has been left off the referees' list for the last two weeks of top-flight action, with the Professional Game Match Officials Board fearing that his inclusion may detract from the match over which he presides.
Clattenburg, assistant referees Michael McDonough and Simon Long and fourth official Michael Jones were all interviewed by the FA on Friday regarding the alleged incident, which took place during Chelsea's 3-2 defeat at the hands of Manchester United at Stamford Bridge.
The Blues allege that the referee used a word which was interpreted as racist by Mikel.
The FA are hoping to come to a decision on the case before Saturday. Should they decide that he is not guilty of any offence, it is possible that Clatternburg could return to action for the following weekend's matches.