According to ESPN, Rene Meulensteen has revealed he was told there was no role for him in the new Louis van Gaal regime at Old Trafford.
The 50-year-old was part of Sir Alex Ferguson's backroom staff at Old Trafford for 12 years and approached the new boss about a possible return. However, the Dutchman has confirmed van Gaal rejected his advances, opting to bring in his own coaching staff.
"I would have been keen to go back," the Dutchman said. "I spent 12 years at what is a fantastic club and never left Man United because I fell out with anyone there.
"They've chosen to appoint Louis van Gaal and he has decided to bring in his own people so that is not an option.
"Have I spoken to Van Gaal? Yes, I know that is the case - it has been confirmed to me.
"It is disappointing. There aren't many coaches who have spent so much time with one club as I have. You would think it would make sense to have some continuity."
He left United last summer and had brief and unsuccessful spells managing Anzhi Makhachkala, where he only lasted 16 days, and Fulham, where he was in charge for three months.
During his time at Craven Cottage he won just 10 points in 13 matches, winning three matches and conceding 34 goals, as his side slipped dangerously towards the foot of the Premier League table.
When Fulham hired Felix Magath in February, the club acted fast, cancelling Meulensteen's contract just four days later.