MOUSSA NIAKHATE is set to officially become a Nottingham Forest player TODAY.
SunSport understand that Mainz ace Niakhate will undergo his medical and sign with Forest within the day as the deal is "done".
The Premier League newcomers forked out £8.6m plus £4.2m in add-ons to the Bundesliga outfit.
The highly-rated defender is now set to put pen to paper on a four-year contract with Nottingham.
The centre-back will later jet off to Alicante to join Steve Cooper's side for pre-season.
The Frenchman becomes Forest's fourth summer signing after the club's return to the Premier League.
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The 26-year-old joins club record signing Taiwo Awoniyi and Giulian Biancone, who joined from Union Berlin and Troyes respectively.
Niakhate also follows Dean Henderson, who will play for Forest on loan from Manchester United this coming season.
He joined Mainz from Metz in 2018 and quickly established himself as a key defender for the German club.
The Frenchman proved to be quite versatile as he can also operate at left-back.
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The former Valenciennes ace amassed a total of nine goals and four assists in 135 appearances across all competitions throughout his four-year stint at the MEWA Arena.
Forest fought off interest from West Ham, Newcastle and Everton to land Niakhate.