Leicester City have made an improved offer of around £36million for St Etienne centre-back Wesley Fofana, which has been accepted by the French side.
Leicester maintain the fee is closer to £30million, but St Etienne insist it is a 40million euro (£36.5m) deal including add-ons.
The deal was confirmed by St Etienne on Tuesday evening, and it is the largest transfer fee ever obtained by the club.
Fofana has been Leicester's prime target throughout the summer but St Etienne had been reluctant to part with the highly-rated 19-year-old.