The 23-year-old went down six minutes after coming on as a substitute in Bayern Munich's 4-2 friendly win at Heidenheim on Tuesday, having also collapsed during a 3-1 friendly victory over RB Leipzig in Munich three days earlier. On both occasions he appeared dazed, received on-pitch medical treatment and was helped from the field.
Bayern sporting director Max Eberl addressed the Heidenheim incident immediately afterwards, saying: "We knew about it and we are aware of the situation. Jamal will speak out. He's in the dressing room, getting changed and taking a shower."
Musiala later posted a lengthy statement on Instagram explaining the diagnosis and reassuring supporters.
"First things first – I'm doing well! I'm especially grateful for your messages and support! I understand that many of you are worried. I'd like to alleviate those concerns today and explain something," he wrote.
"I've been diagnosed with temporary, brief, but easily treatable absence seizures, which are due to a neurological dysfunction. These can lead to the recent episodes, like the one against Leipzig or now in Heidenheim. I know they seem scary at first glance – but for me, they're currently just part of my everyday life.
"I'm receiving excellent medical treatment and am very optimistic. FC Bayern and my family and friends are always by my side and supporting me on this journey. Importantly, there are no further health risks.
"In close consultation and regular communication with the experts, it was my personal wish to face this challenge and, with the clearance from the neurologists, to continue focusing on what helps me most in my recovery: simply living my daily life and pursuing my passion for playing football.
"I've taken responsibility for that. Overall, I have a very good feeling and I'm on the right track. What helps me most on this path is continuing to chase victories and titles with my team and your amazing support.
"I hope you can understand me better now. At the same time, I ask for your understanding that I would like to keep this matter within my closest circle of confidants, the club, and the experts. Thank you so much, J."
Absence seizures are typically short episodes lasting between five and 15 seconds, and are one of several forms of seizure linked to underlying neurological conditions.
Musiala's setback comes after an injury-disrupted period for the Germany international, who missed the first six months of last season after breaking his ankle at the 2025 Club World Cup. He returned in the second half of the campaign and started three of Germany's four matches at the 2026 World Cup this summer.
The episodes prompted a show of support from teammate Harry Kane, who was reported to have told Bayern and Heidenheim players to form a protective shield around Musiala as he received treatment following the second collapse. Bayern have not yet indicated whether the diagnosis will affect Musiala's involvement in pre-season training or the club's opening matches of the new campaign.