Borussia Dortmund have concerns over the actions of Ousmane Dembele's agent.

BILD says BVB officials have learned that the striker's representative, Moussa Sissoko, has been in contact with Bayern Munich and Barcelona about prising the youngster away from Dortmund.

Manchester City and Manchester United have also been linked with Dembele, amid claims of the Frenchman visiting Manchester last week.

Dembele is tied to BVB until 2021, having only joined a year ago from Rennes.

And it's also suggested both Bayern and Barca have been surprised by Sissoko's offer, knowing Dembele only moved to Dortmund a year ago.