Tottenham manager Andre Villas-Boas had lined up a move for Coentrao after central defender Jan Vertonghen made it clear he was unhappy filling in for the injured Danny Rose at left-back, says the Daily Mail.
But he will face competition from Old Trafford counterpart David Moyes, after it emerged the 25-year old is back on United's wanted list.
United ran out of time to complete a season-long loan deal for Coentrao in the last window but have revived their interest and are ready to explore the possibility of signing him on a permanent basis.
Both clubs can draw encouragement from reports in Madrid that he was distraught when his proposed move to United at the beginning of September fell through.
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