Once again Bayern Munich is trying to hire another palyer from Dortmund and that's what they usually do when they need players. Dortmund and Bayern Munich are the main competitors in the Bundesliga but still, there are many players they left Dortmund for Bayern Munich so far. Since Bayern Munich needs a goalkeeper they want to hire Gregor Kobel from Dortmund, however, this player extended his contract recently until 2028 and this can't be easy for Bayern Munich to hire Gregor Kobel.
Not problem with Dortmund goal keeper have extend his contract until 2028 depend how excited with Bayern Munich bid offer, both team have good communicate with transfer players depend high bid offer from Bayern its not problem for Dortmund sell their goal keeper. Looking on transfer activities last several years, Bayern Munich have signed many Dortmund player as free agent or have to pay with transfer fees. I don't think Dortmund will reject with Bayern Munich interested for their goal keeper Gregor Kobel if can pay highest fees transfer. Not problem for Dortmund have to sell their player with rival teams, so far Dortmund not priority with their rival team winning or dominance in domestic league but also Dortmund have decision with business profitable.