Legendary Italian coach Fabio Capello has attempted to explain why Kalidou Koulibaly is struggling so far at Chelsea.

The Senegalese centre-back completed a big money move from Napoli to the Stamford Bridge club this summer.

He has started as a left-sided centre-back in manager Thomas Tuchel's 3-4-3 formation.

"I would like to talk about the difficulties of Koulibaly at Chelsea," Capello told Sky Calcio Club.

"In Naples, he was doing everything by himself. His problems now depend on the speed with which they play in England.

"It's the same pace used by Udinese to give Roma fits. It's something that must make us Italians reflect."