Former referee's chief Keith Hackett has criticised the appointment of Manchester-based referee Anthony Taylor for Monday's meeting of Manchester United and Liverpool.
Taylor lives six miles from Old Trafford, which Hackett believes could lead to allegations of partiality.
"No-one is questioning his integrity," Hackett said. "But what if something goes wrong? It would be intolerable."
Taylor has no ties to United and is a fan of northern league side Altrincham.
Hackett, the former head of the Professional Game Match Officials Limited body which appoints referees to matches, also pointed to the fact that Mark Clattenburg will be acting as a fourth official at another game this weekend.