The 26-year-old was confirmed earlier this week as set to undergo a medical with the Vesuviani, ahead of completing a move to the Stadio San Paolo for a reported €10million (£8.6m) fee.
Through their official Twitter account, Napoli have posted a picture of the versatile winger putting pen to paper on his contract, said to be worth €3.5m (£3m) a season.
“Now it is official, Jose Maria Callejon is a player of Napoli! #WelcomeCallejon,” the Serie A side posted.
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