Sky Sports understands that Sunderland have agreed a fee with Bursaspor for Alfred N'Diaye.
The Black Cats made an initial approach for N'Diaye last week and held talks with the Turkish club.
Sunderland had a first bid rejected, but they are now understood to have agreed terms on a deal worth €4million (£3.2million).
N'Diaye is now due to arrive in England to have a medical and finalise terms with Sunderland, before signing a deal.
N'Diaye is a French Under-21 international, who began his career with Nancy before moving to Turkey in 2011.
He has emerged as a real talent since his move, and a number of clubs from around Europe were believed to be keeping tabs on his signature but now Sunderland look to have won the race for him.