Sky Deutschland says Wolfsburg are ready to test Brentford's resolve in January with an offer for Ajer.
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Ajer has a deal to 2028 and Brentford are under no pressure to sell.
Wolfsburg made a €15m attempt last summer, which was immediately rejected.
Indeed, Ajer is regarded by Brentford manager Keith Andrews as a key player and offers won't be encouraged over the New Year.
