Callejón has signed a four-year deal with last season’s Serie A runners-up for a fee of around €10 million.
The 26-year-old started his career at Real Madrid and went through the youth academy before playing for Real Madrid’s C and B teams.
2008 Callejón wanted a change and chose to go to Espanyol. He made 97 appearances for Espanyol during 3 years before moving back to his boyhood club Real Madrid.
Callejón has now spent two years at los Blancos but will now play under new boss Rafael Benitez at Napoli.
Viktor Johansson