Bayer Leverkusen are concerned with the negotiating tactics of Chelsea managing director Marina Granovskaia over their move for Kai Havertz.

The Daily Mail says Granovskaia has sensationally been accused of espionage after reportedly asking her network of agents to find potential weaknesses in Bayer Leverkusen's hierarchy as she tries to bring down the cost of signing Havertz.

BILD reports Granovskaia is trying to discover any potential flaws within the Leverkusen negotiating team in order to make the deal better for the Blues.

It is claimed Granovskaia has asked 'several German player consultants' about information on Rudi Voller and Fernando Carro, who will be at the forefront of negotiations for the Bundesliga side.

Granovskaia has a reputation for her fierce negotiating skills, proven by the way she handled Eden Hazard's departure to Real Madrid last summer.