Amorim's position is again being questioned after yesterday's disappointing defeat at Brentford.
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BBC Sport is reporting United sources are insisting Amorim's job is not up for discussion.
Reports of a shortlist of replacements being drawn up internally has also been dismissed.
After defeat at the Gtech, Amorim said: "I am never concerned about my job - I am not that kind of guy.
"It is not my decision. I will do the best I can every minute I am here."