Manchester United boss JOSE MOURINHO ramped up his interest in Napoli defender Kalidou Koulibaly, according to the Daily Record.
The Red Devils were linked with a number of centre-backs during the summer transfer window, but the Portuguese boss was ultimately left frustrated.
He is said to be determined to strengthen his options in a defensive position, however, with the 20-time English champions already conceding 21 goals in the Premier League so far this season.
Koulibaly, 27, only signed a new long-term contract with the Partenopei back in September, however, and his current deal is set to expire until the end of the 2022-23 campaign.
Earlier, it was reported that the Spanish champions Barcelona were prepared to launch £88m to sign the Senegal international.