The agent of Kalidou Koulibaly admits the Napoli defender has been a long-term target for Manchester United.

United have been linked with a €100m bid for the Senegal international.

Agent Bruno Satin said, "When I took Kalidou to Napoli, Manchester United had already contacted me to inquire about the boy.

"He's one of the best defenders in the world and he has the perfect profile for English football.

"United has never stopped following him and maybe they have an advantage over others ... we'll see what happens."