The Portugal attacker has endured a tough first season since his big summer move to Atletico, with his value now said to have fallen to around £72.9 million, due to the current financial crisis surrounding football - as per Transfermarkt.
United had been prepared to cough-up the €130 million that the LaLiga paid Benfica for the 20-year-old last summer, but it would now appear that the player could be available for a much smaller fee.
Indeed, Spanish daily AS says United have already made 'first contact' with Felix over a potential move to Old Trafford and to gauge whether a move to Old Trafford would be of interest to him.
Felix is yet to convince Diego Simeone of his quality and they would not stand in his way were a big-money bid to land at their feet.