Rene Meulensteen is in a bitter payoff battle with Manchester United.
The Dutchman is still officially employed by United but is upset at his treatment after almost 12 years' service.
A source close to Meulensteen told The Sun: "Rene is really disappointed at what is happening. His representatives are trying to sort it out.
"He loves United after so many years there and is sad about leaving.
"But he can't believe the way the club are handling his departure."