The 26-year-old will travel to London this week to undergo a medical and to agree on personal terms with the club.
Brentford have been on the search for a new centre-back after John Egan moved to Sheffield United for £4m.
Talks with Olympiacos to sign Bjorn Engels were unfruitful, and Brentford turned to other options.
He made 33 appearances for the Ligue 2 side, scoring two goals and making two assists.