Borussia Dortmund player Emre Can, 26, tested positive for COVID-19 on Friday.
The Germany international, who was unable to travel with the team for the Champions League match in Rome due to suspension, is currently not experiencing any symptoms and is in quarantine at home.
All the other test results for players and staff members came back negative on Friday.
Following intensive discussions with the health authorities in Dortmund, the final training session prior to the Ruhr derby on Saturday was postponed at late notice from its original time of 17:00 CET to 18:30 CET. There is no reason for the game not to go ahead.
Borussia Dortmund hope that Emre Can experiences as few symptoms as possible during the period of infection and that he recovers soon.