Gabriel Magalhaes is set to join Arsenal from Lille on Sunday for £27m fee.
The 22-year-old agreed to sign for the Emirates who were in race with Manchester United, Everton and Napoli.
Gabriel was a key member of the Lille side that finished fourth in Ligue 1 last season and started each of their games in the Champions League, including twice against Chelsea.
The center-back watched Lille’s opening day 1-1 draw with Rennes from the stands last night and is due in London in the next 48 hours to complete a medical.
He alongside William Saliba, 19, who was signed from St Etienne for £27m last summer, will boost Arsenal’s defence.
This is the second time in 12 months Arsenal have signed a player from Lille, after Ivory Coast international Nicolas Pepe’s £72m move to the Emirates from the French club last summer.