"He has been available for all phone calls and meetings," spokeswoman Nicole Mommsen said by phone. Diess has not experienced any symptoms "that might have prevented him from doing his job."
Diess, 63, is vaccinated and has received a booster vaccination, which means he can leave quarantine after seven days if he tests negative. He did not have any major meetings planned in the next week.
He is expected to be available to return to the office or resume travel next week.