Ashworth was shown the door on Sunday after defeat at home to Nottingham Forest - just months after his arrival from Newcastle United.
After seeing over 250 staff members cut this year, a fifth of club numbers, those still with United are concerned who could be next under the Sir Jim Ratcliffe regime.
"If they’re prepared to do that to a sporting director hired at great cost after five months, what about the rest of us?” one staffer told the Telegraph.
Another source said: “People are quite fearful. It’s not a nice place to be at the moment."
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