Sporting announced on Tuesday that United had made an approach and shown a willing to pay Amorim's €10m buyout clause.
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However, there will remain some issues to be ironed out before Amorim takes his place in the United dugout.
There remains a discussion to be held over Amorim's backroom team and compensation if they are to follow the coach to Old Trafford.
There is also talk of whether Amorim must serve a spell of gardening leave before being cleared by Sporting to join United.
The chances of the Portuguese being in charge for Sunday's clash with Chelsea are now diminishing.