The German Football Agent Association (DFVV) has lashed out at the agents of want-away Borussia Dortmund striker Robert Lewandowski, for the way they have tried to engineer his exit from the club.

The Polish international is heading into the last year of his contract at Dortmund and has made no secret of his desire to quit for Bayern Munich.

But Dortmund do not want to lose the prolific marksman to their biggest local rivals and have told him he is simply not for sale.

Lewandoswki’s agents however, continue to agitate for the striker’s sale, much to the dismay of Dortmund, and now Germany’s highest football authorities.

Gregor Reiter, head of the DFVV, has lambasted agents Cezary Kucharski and Maik Barthel, and told them to accept that Dortmund do not want to sell their client.

Reiter has emphasised that while Lewandowski is contracted to Dortmund, it is the club’s prerogative whether or not to sell him.

“For months they have been shouting Lewandowski’s name from the rooftop. This is not a manifestation of a serious business conduct,” Reiter told Sport1.

“Robert Lewandowski is under contract at Borussia Dortmund until June 30, 2014.

“More than once Borussia Dortmund have made it clear that they are not willing to release the player before the end of his contract. End of discussion.”