Liverpool are being linked with a January bid for Napoli defender Kalidou Koulibaly.

According to Italian journalist Fabio Santini, Liverpool have already stepped up their interest in Koulibaly following Virgil van Dijk's injury.

Santini, a journalist covering Napoli, said: "Attention: I have sensational news about Kalidou Koulibaly.

"Manchester City and United are on the Senegalese defender as well as PSG. The club that is more serious for the Senegalese is Liverpool.

"The Reds offer to Napoli a figure between 70 and 75 million euros, the sum that [Napoli chairman] De Laurentiis asks."