Manchester City reportedly failed with a bid of £55m plus bonuses for Napoli defender Kalidou Koulibaly during the summer transfer window.
The Senegal international has continued his association with the Serie A giants, despite frequent speculation regarding his future at Stadio San Paolo.
City were one of a number of clubs interested in signing the 29-year-old, who is regarded as Napoli's most prized asset.
However, Calciomercato claims that the Premier League giants were only prepared to pay a guaranteed £55m, which was significantly below Napoli's asking price.
The report says that president Aurelio De Laurentiis would have only considered parting ways with Koulibaly if the club received in excess of £75m.
Koulibaly turns 30 in June, which will likely result in his valuation being reduced unless he extends his contract past 2023.