Referee Felix Zwayer had turned down Borussia Dortmund’s appeals for a penalty before awarding one to Bayern for a handball from Mats Hummels.
The England international has been charged with unsportsmanlike behaviour and has accepted his punishment.
Emotions ran high at the end of Der Klassiker, which Bayern Munich won 3-2, and Dortmund midfielder Jude Bellingham, 18, distrusted the appointment of Zwayer, who was banned for 6 months in 2005 for his involvement in a match-fixing scandal.
After the game Bellingham told ViaPlay in a flash interview: “You give a referee that has match fixed before the biggest game in Germany, what do you expect?”
BELLINGHAM: – You give a referee that has match fixed before, the biggest game in Germany, what do you expect?
— Viaplay Fotball (@ViaplayFotball) December 4, 2021
In a statement on Tuesday, the DFB said: “The sports court of the German Football Association (DFB) fined Jude Bellingham with a fine of 40,000 euros in single judge proceedings after the DFB control committee had brought charges for unsportsmanlike behaviour.
“The player of the Bundesliga club Borussia Dortmund has already agreed to the judgment, the judgment is now final.
“After the Bundesliga match against Bayern Munich on Saturday, Bellingham said in a TV interview about referee Felix Zwayer: ‘You give a referee who has already match-fixing the biggest game in Germany. What do you expect?’.
“As a result, he had questioned the referee’s impartiality and ultimately denied it.”
FC Bayern’s win in the derby saw them German champions move four points clear of Dortmund at the top of the Bundesliga.
Jude Bellinghamjoined Dortmund from Birmingham City in July 2020 in a deal that could eventually be worth over £30m.