Bayern Munich coach Vincent Kompany has called on Bundesliga referees to protect top players like his young star Jamal Musiala from attacks by opposing players. Musiala returned from hip problems with a goal in last week’s 5-0 league win at Bochum, and then scored a hat-trick in Wednesday’s 4-0 German Cup win at Mainz where he was rested in the second half. Leaders Bayern host Union Berlin on Saturday. The visitors are fourth, boast the second best defence with five goals let in, and Kompany said on Friday he hopes things won’t get too physical against Musiala and others. “We don’t need to cha…