Former Napoli goalkeeper Gennaro Iezzo is delighted for Kalidou Koulibaly over his new contract.

The defender penned a new long-term deal last week.

Iezzo says Koulibaly is underestimated and the pay-hike is well deserved.

"Koulibaly is a force of nature, has a different strength and pace of the others," said Iezzo to Radio Kiss Kiss.

"I like his personality and he is better technically than many think. "