Sunderland have completed the signing of Lorient midfielder Didier Ndong.
The 22 year-old moves to the Black Cats for €20 million, reports L'Equipe. He becomes the richest transfer in Sunderland history.
The Gabon international has signed a five-year contract after flying into Wearside last night.
Ndong had been tied to Lorient until 2019.