Italian and Spanish reports suggest Sampdoria and Atletico Madrid have agreed a €20m deal, but Luciano Vietto is still unconvinced.
The striker has also been linked with Monaco and Southampton after returning from his loan spell at Sevila.
According to Sky Sport Italia, the Blucerchiati have seen their €20m proposal accepted by Atleti.
The only sticking point is the player himself, who is trying to make the right decision for his future.
Moving to Samp would mean regular playing time, but also a pay cut, as he currently earns €2.4m per year and would need to accept €1.6m plus bonuses.