Anthony Martial and Nemanja Matic were missing from Manchester United's team hotel last night.
The Sun says the pair were not seen arriving at The Lowry Hotel with the rest of Manchester United's squad ahead of today's showdown against Liverpool.
It is unclear whether Martial and Matic are injured or simply arrived separately from their team-mates.
There was also no sign of Phil Jones, Antonio Valencia or Matteo Darmian.
Martial, 23, injured his groin in this month's 2-0 defeat at home to Paris Saint-Germain but is ahead of schedule in his fight to return to fitness.
Matic, 30, trained with the squad on Friday and is not believed to be nursing any injuries.