The former West Germany international believes the Signal Iduna Park side will find it difficult to resist offers for the attacker after he rejected a new contract with the club
Bayern Munich chief executive Karl-Heinz Rummenigge believes Borussia Dortmund will face a tough battle to hold on to star player Marco Reus.
On Tuesday, German newspaper Bild reported that the 25-year-old rejected the opportunity to sign a new contract in order to engineer a move elsewhere.
The German international has a reported €35 million [£27.7m] buyout clause in his current contract, which expires in 2017, and is being chased by some of Europe’s top clubs, including Manchester United and Barcelona.
Bayern are also thought to be interested in the attacker, who has scored 30 goals in 62 appearances since he joined BVB in 2012, and Rummenigge thinks Reus's intention is clear following his decision not to extend his current dea at Signal Iduna Park.
"I think that it is hard for Borussia Dortmund,” Rummenigge told Bild.
“Europe’s top clubs will be very interested to find out Reus’ buyout clause [after he rejected a new contract] as the player is in high demand from a lot of big clubs other than FC Bayern Munich.”