Bayern Munich head into Saturday's Super Cup against Borussia Dortmund at Signal Iduna Park with a medical concern dominating the build-up. Jamal Musiala collapsed for the second time in four days during Tuesday's 4-2 friendly win over Heidenheim, this time just six minutes after coming on as a substitute. The 23-year-old was treated on the pitch before leaving the field supported by a member of staff. Hours later, Musiala addressed fans directly on Instagram, confirming he has been diagnosed with temporary absence seizures linked to a neurological dysfunction. He described the episodes as manageable and said he is receiving treatment, insisting there is no wider health risk. The result in Heidenheim was secondary to those concerns, though Bayern's attacking depth was evident, with goals from Felipe Chavez, Arijon Ibrahimovic, Luis Diaz and new signing Nathaniel Brown. Defensive frailty remains a concern, with Bayern conceding in five of their six pre-season games. Konrad Laimer, who suffered a leg injury against Leipzig on Saturday, was absent in Heidenheim, adding uncertainty to Kompany's options for the weekend. Off the pitch, the club continues to work through a busy transfer window. Joao Palhinha's future remains unresolved, with Aston Villa re-entering talks after earlier negotiations collapsed, while Benfica and Newcastle have also been linked. Sporting's confirmed signing of former Bayern talent Manu Irankunda will bring the club up to 7.2 million euros through sell-on fees. A potential 250-million-euro investment from Viessmann is not expected to close quickly, with reports indicating no urgency on the investor's side.