Milan could lose Porto striker Jackson Martinez to Atletico Madrid, claim papers in Spain and Portugal.
A deal had essentially been done last week with the Rossoneri agreeing to pay the €35m release clause in his contract.
The player is in Chile on international duty for the Copa America, so the plan was to have Milan doctors fly out for a medical at the Colombia camp.
However, that has not happened yet and Atletico Madrid are stepping up to intercept.
According to both Portuguese paper O Jogo and Spain’s As, Atleti have dived in with a new proposal and hope to sway the player towards them.
The key advantage they have is Champions League football, whereas Milan have not even qualified for the Europa League for the second year running.
Arsenal also remain on the fringes after Martinez made comments about how much he admires the Gunners.
The Rossoneri became distracted by the feud with Inter over Monaco midfielder Geoffrey Kondogbia and risk letting Martinez slip through their fingers.