Jadon Sancho is among a group of Borussia Dortmund stars who risk censure over the hiring of a celebrity hairdresser.
The Bundesliga, which is the first of Europe's top five leagues to restart following the interruption to the 2019-20 season caused by the coronavirus pandemic, has established strict guidelines in order to prevent further spread of the illness and protect the health of players and staff.
Players are subjected to regular testing and on the pitch are discouraged from shaking hands with opponents, celebrating goals with hugs or any other non-essential physical contact.