By Sean Walsh Bayern Munich have rejected Manchester United’s double bid for defenders Matthijs de Ligt and Noussair Mazraoui, according to several reports. The Red Devils remain in the market for defensive reinforcements and have long identified the Bayern duo as solutions to their current problems. Personal terms have already been agreed with centre-back De Ligt and right-back Mazraoui. With both players represented by the same agent, Rafaela Pimenta, United lodged a joint bid to Bayern in recent days. However, various reports claim Bayern have knocked back this approach, though the two club…