There has been an underlying tension this season in the Spanish capital between Felix, 23, and his manager, Diego Simeone.
Diario AS reports that the 'conflict' between them has reached a point of 'one or the other' and that Atletico are now ready to cash in on Felix as early as January, for a figure close to £86m.
But expectations have been sky high as a result and he has failed to consistently live up them, more and more finding himself on the bench in Madrid.
Manchester United are looking for reinforcements in attack having terminated the contract of Cristiano Ronaldo last month, as well as injuries hampering the number of opportunities open to Anthony Martial.
PSG sporting director Luis Campos is the link to Felix and he can be the one to sell the vision of how he could fit into the Christophe Galtier project in Paris.
Felix's agent, Jorge Mendes, is said to be actively shopping his client for a new club, with no hope of repairing relations with Atletico.