The former RB Leipzig boss was absent for his side's third Champions League clash of the season, which ended in another comprehensive victory.
Bayern Munich coach Julian Nagelsmann has tested positive for Covid-19 after missing his side's Champions League victory over Benfica on Wednesday with a "flu-like infection".
Nagelsmann has enjoyed a fantastic start to life on the Bayern bench since moving from RB Leipzig over the summer.
However, he had to watch from afar as his charges continued their perfect start in Europe at the Estadio da Luz with a 4-0 victory - with assistant coaches Dino Toppmoller and Xaver Zembrod overseeing events from the touchline.
What was said?
"Julian Nagelsmann, 34, head coach of FC Bayern Munich, tested positive for the corona virus despite being completely vaccinated," Bayern have said in a statement on the club's official website.
"He will return to Munich separately from the team in a medical plane and will go into domestic isolation."
Earlier reports claimed that Nagelsmann began to feel unwell in the team hotel in Lisbon and thus decided to stay behind when the rest of the Bayern squad made their way to the game as a precautionary measure.
He will now be missing from the bench again when the Bundesliga title holders return to domestic action on Saturday in a home date with Hoffenheim.