Manchester City are said to have tabled a £44.5m offer for Mendy, as they look to further add to their full-back ranks ahead of the new campaign.
Less than a week on from signing Kyle Walker from Tottenham Hotspur in a world-record deal for a defender, the
Daily Mail reports that City have now officially made a move for the France international.
It is claimed that Monaco instead value their title-winning player higher than Walker, though, with the Ligue 1 champions holding out for a sum of £54m.
Chelsea are also understood to have made an enquiry this summer and could match any successful bid from their Premier League rivals, having seen their attempt to sign Alex Sandro from Juventus hit a brick wall.
City boss Pep Guardiola is desperate to freshen up both defensive flanks during the off-season, with Danilo also expected to join from Real Madrid in the coming days – direct competition for Walker on the right.