Serge Gnabry "has tested positive for the coronavirus. The FC Bayern forward is okay and isolating at home," Bayern said ahead of the quarter-final, first leg tie against PSG.
Should Manuel Neuer drop out, reserve goalkeeper Alexander Nuebel could make only his third start this season.
Bayern suffered a 2-1 defeat at Eintracht Frankfurt on Saturday following a 3-3 draw against strugglers Arminia Bielefeld upon their return from winning the Club World Cup in Qatar 11 days ago
The win leaves Bayern 10 points clear of second-placed RB Leipzig, who have a game in hand away to crisis-hit Schalke.
Bayern Munich were 2-0 up after 26 minutes, thanks to a Robert Lewandowski penalty and a superb Leon Goretzka goal at Borussia Park.
Bundesliga: Leroy Sane has to 'justify' price tag, says Bayern Munich chairman Karl-Heinz Rummenigge
A string of disappointing performances by Sane since he joined in a 50-million-euro ($61 million) move in the summer was capped on Saturday when he was removed just half an hour after entering the field as a substitute in Bayern's 2-1 win against Bayer Leverkusen.
Bundesliga: Bayern Munich claim 3-1 win over Stuttgart; Ellyes Skhiri stars as Cologne down Borrusia Dortmund
Borussia Dortmund lost at home to Cologne 2-1 and Bayern Munich survived a scare at Stuttgart to open a two-point lead in the Bundesliga.
Bayern Munich boss Hansi Flick challenges Kingsley Coman to bring Champions League form to Bundesliga
Coman picked up where he left off in last season's final 59 days previously in Lisbon, where he headed the winning goal against Paris Saint-Germain.
Bundesliga: Bayern Munich's Kingsley Coman in isolation at home after contact with coronavirus-positive person
Bayern didn't say how long the France winger would need to spend in quarantine, or whether he's available to play Schalke on Friday in the German champion's first league game of the new season.
Champions League: Methodical Bayern Munich battle past Paris Saint-Germain to claim sixth European Cup
Heading into the match against PSG, it seemed rather inevitable that this new look Bayern would rip the French club from limb to limb, but the actual match turned out to be much closer than expected
PSG struggled to impose themselves on the German giants who have now won Europe's top prize on six occasions.
Champions League: Bayern Munich beat PSG by solitary Kingsley Coman goal to claim sixth European Cup
It was often a cagey final, with a bit of needle between the teams, but chances too, especially before Coman appeared at the back post to head in Joshua Kimmich's inviting 59th-minute cross and wrap up a treble for a team who had already won the Bundesliga and German Cup.
Bundesliga: Robert Lewandowski powers Bayern Munich to eighth consecutive title with 1-0 win over Werder Bremen
The league’s top scorer latched onto a superb Jerome Boateng cross and fired in his 31st goal of the campaign just before the break to send the Bavarians 10 points clear of second-placed Borussia Dortmund, who have three games left.
Bundesliga: Borussia Dortmund, Hertha Berlin players kneel for George Floyd as Bayern Munich keep cruising with another win
Bundesliga was marked by gestures against racism and support for the Black Lives Matter movement on Saturday as Bayern Munich took another step toward a record-extending eighth straight title.
Bundesliga clubs returned to training earlier this week after almost a month off due to the COVID-19 outbreak and while the players are still being kept at a safe distance from each other Bayern Munich forward Kingsley Coman is just happy to be back.
Bundesliga: Serge Gnabry scores twice as Bayern Munich thrash Cologne 4-1; Schalke play out goalless draw against Mainz
Serge Gnabry scored twice as Bayern Munich beat Cologne 4-1 on Sunday to reclaim the top spot in the Bundesliga.
Bundesliga: League top-scorer Robert Lewandowski, winger Serge Gnabry to return for Bayern Munich against Hertha Berlin
Bayern, who won the previous seven league titles, are in third place in the Bundesliga, on 33 points, with Borussia Moenchengladbach second on 35
Bundesliga: Bayern Munich's Serge Gnabry faces extended period on sidelines as injuries plague defending champions
Bayern Munich has been hit with a string of injuries, including one which may force winger Serge Gnabry to head home early from the team's training camp in Qatar, coach Hansi Flick said.
Champions League: Bayern Munich swat aside Red Star Belgrade 3-0 as Robert Lewandowski scores 200th goal for club
Brazilian Philippe Coutinho had the hosts’ first good chance in the 21st minute, as Bayern dominated possession from the start but had to remain patient
Euro 2020 qualifiers: France, Portugal get campaign back on track with dominating wins over Balkan opponents; England thump Bulgaria
France and Portugal got their Euro 2020 qualification campaigns back on track with impressive wins over Balkan pair Albania and Serbia.