The 26-year-old Ivory Coast international played over 100 games for French Ligue 1 team Lorient.
Sunderland are second-bottom of the Premier League, four points adrift of safety, and have conceded 46 league goals this season, more than any other team in the top flight.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
(Reporting by Ed Osmond; editing by Toby Davis)
Share
