The 26-year-old, who scored seven goals for los Blancos last term, is on the verge of leaving the Santiago Bernabeu for the Partenopei, the Italian club confirmed on Tuesday
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But the Spaniard is now edging towards departing the club for a second time after failing to secure regular first team football at the club, as Rafa Benitez's Naples revolution continues.
"In the early afternoon, Jose Callejon landed in Napoli and will carry out medical examinations tomorrow morning," Napoli confirmed on their official Twitter page.
The former Spain Under-21 international's impending arrival could pave the way for the Partenopei to finally sanction the sale of striker Edinson Cavani.
Paris Saint-Germain have been strongly linked with the Uruguay international following coach Laurent Blanc's revelation that the Ligue 1 champions are interested in his services.