Bayern Munich star Alphonso Davies has been ruled out of action for the foreseeable future after myocarditis was detected.
The Canadian international tested positive for COVID-19 just after the turn of the year.
The Bundesliga has been observing its winter break for the past month, meaning Davies hasn't played since December's 4-0 win over Wolfsburg.
Bayern resume away to Cologne on Saturday, but will do so without the 21-year old full-back. Davies did train on Wednesday, with teammates who had also recently tested positive for COVID-19.
"With Phonzy, when we did our follow-up examination yesterday that we do with ever player that has had Covid-19, we detected signs of mild myocarditis, i.e. an inflammation of the heart muscle," Bayern head coach Julian Nagelsmann revealed on Friday.
"He'll sit out training until further notice. He won't be available, also in the coming weeks.
"The ultrasound shows this myocarditis isn't so dramatic but it's a sign of myocarditis. Still, it has to heal and that will definitely take some time."
The CDC say that patients with myocarditis "can usually return to their normal daily activities after their symptoms improve".
Manuel Neuer, Dayot Upamecano, Omar Richards, Leroy Sane and Tanguy Nianzou will all be available to Nagelsmann following their respective infections.
The head coach warned, however, "None of them are 100 per cent fit. Some of them had symptoms.
"They're back in the squad, but none except Manu are ready to start or play for long."