The Cologne club said to only isolate the positively tested persons has found the approval of local health authorities. The club said the strategy of regular testing is allowing individual solutions for every tested case.

Other squad members and staff haven't been direct contacts of the positive tested the club claims. One player admitted having had contact with one of the cases.

It remains uncertain if the concept of individual solutions can be maintained when regular team-training starts again and games take place as the number of so-called direct contacts is going to increase.

Before the clubs can return to team training, health authorities must give their approval. Leipzig and other clubs claim to have received "positive signals" after talks.

Critics say to only isolate positive tested is not the right way and hasn't been part of the concept that caused mostly approval by politicians.

Professor Dr. Tim Meyer, head of the league's corona task force, admitted the susceptibility of the implemented system.

"A large number of positive tests can endanger the system," the medic said, adding: "It requires a great amount of discipline of all involved."

Meyer said 2000 people had been tested in the first round. "We can't exclude getting further positive results; we didn't expect to get none."

To minimize the risk, only players are allowed to attend the team training that has been tested negative twice in advance. "It is an illusion to expect complete security, but that hasn't been a realistic goal," Meyer commented.

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