Callejon will be the first to renew his contract with Napoli

At the end of the season, Napoli are now looking to secure contract extensions with certain players, with Milik and Zielinski the two most important ones.

Callejon, 32, has a contract in Naples until 2020, but as one of the most important players at Napoli, is expected to renew and stay for longer.

The former Real Madrid forward, has been a permanent fixture in the Napoli attack, emerging as one of the leaders of Carlo Ancelotti's reign in Italy.

Callejon has been at Napoli since 2013, when he left the Bernabeu for more first team opportunities.