The 26-year-old leased on loan last season with the Turkish giants, where he scored an impressive 37 goals and gave seven assists in his 41 games.
Galatasaray remains inadequate in their aim to make that movement permanent, but have so far not been able to agree the conditions with Napoli.
Napoli is supposed to keep the release clause of € 75 million from Osimhen and are unhappy with the conditions they have been offered by Galatasaray.
Their offer corresponds to the asking price, but it would be paid in installments instead of downright, and President Aurelio de Laurentiis now sets more demands.
According to As, he wants specific payment prints, together with an interest of '20 percent in the subsequent signing of Osimhen and a guarantee that the player would not be sold to Italian clubs for three years'.