Borussia Dortmund's Jadon Sancho branded the decision to fine him after being pictured having a home haircut without wearing a mask an "absolute joke".
England forward Sancho's teammate Manuel Akanji has also been fined after they were deemed to have broken rules.
Photos emerged of Sancho, 20, and 24-year-old Swiss defender Akanji having their hair styled in their respective homes, with neither the players nor the hairdresser wearing any personal protective equipment.
"Absolute joke DFL," tweeted Sancho, which was later deleted.
The German league *DFL) said in a statement: "The players from Borussia Dortmund had obviously violated general hygiene and infection protection standards at home hairdressing appointments and in particular the medical-organisational concept of the DFL task force.
"There is no question that professional footballers also have to have their hair cut. However, this currently has to be done in accordance with the medical-organisational concept."
The German football federation (DFB) decided on Wednesday it would not fine Sancho for lifting his Dortmund shirt to reveal a t-shirt bearing the message "Justice For George Floyd" during the win against Paderborn last weekend.
The Bundesliga became the first of the major European football leagues to resume on May 17, following the coronavirus shutdown.
Players and coaches must follow strict health guidelines, including regular testing and only remaining with family members or teammates in between matches.
