Second-division German football club Erzgebirge Aue put their entire squad in home isolation on Tuesday after a member of staff tested positive for the coronavirus.
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It was the first confirmed case in the German league's second round of testing, coming a day before a government meeting on loosening lockdown measures could pave the way for football to return in empty stadiums.
Aue didn't name the staff member involved or say how the person could have contracted the coronavirus. The club didn't report any positive tests from the first round of testing last week.
All players, coaches and backroom staff will stay at home ahead of more coronavirus testing on Thursday, though German football's restart plan doesn't require automatic quarantine measures.
Ten people tested positive last week from the 36 clubs in the top two men's divisions. That included two Cologne players and a staff member. The club did not put its squad in isolation, nor did second-division club Stuttgart, which reported one "inconclusive result.''
The other cases have not been publicly attributed to any club. The German Football League, which oversees the top two divisions, has asked clubs not to disclose cases.
Last week, Chancellor Angela Merkel and 16 state governors postponed a decision on whether the Bundesliga could resume without fans present. She warned there was still a danger that COVID-19 infections could rise if containment measures were relaxed too soon.
A meeting between Merkel and the governors on Wednesday will discuss resuming football in Germany. The league's plan has faced public criticism regarding the use of coronavirus testing kits on people who appear healthy, and concerns that fans could gather near stadiums.
There was a further backlash Monday after Hertha Berlin forward Salomon Kalou live-streamed a video of himself greeting teammates with physical contact and bursting in on a teammate's coronavirus test. Kalou was suspended by the club.
Commenting on the incident on Tuesday, Health Minister Jens Spahn said German football's plan was sound despite the flouting of social distancing shown in Kalou's video.
"The basic concept makes sense and can also be an example for other pro sports categories, by the way. But it has to be lived, too,'' Spahn told Deutschlandfunk radio.
The influential state governor of Bavaria, Markus Soder, was more critical.
"The league makes excellent concepts and then there are individual players, who you can read about, who are behaving very, very, very incorrectly,'' he said in televised comments. "I find it good, too, that the professional clubs take a very hard stand against it because that brings the whole concept into disrepute.''
Clubs in the top two divisions have committed to finishing the season by the end of June.
The first step to resuming the season is to get teams back into full training, rather than the small group sessions they've run in recent weeks.
Title contender Leipzig have clearance to train after the state of Saxony updated its rules on the coronavirus Monday. Wolfsburg team manager Jorg Schmadtke told the German website Sportbuzzer that his side was also resuming full-team training after talks with the mayor.