Bayern Munich star Bastian Schweinstweiger was reprimanded on Friday for lambasting a journalist before turning his anger on teammate Arjen Robben during a press conference.
With Bayern set to take on arch-rivals Schalke 04 in a highly-charged league match on Saturday, Schweinsteiger raged at a reporter during a press conference, but his words have drawn criticism from Bayern's chairman.
The 26-year-old stormed out of the conference room, only to return to criticise Robben, who the day before had questioned Schweinsteiger's lack of authority as captain.
Bayern's vice-captain Schweinsteiger had been irked to be dubbed 'Chefchen' -- a play on words in German implying a boss without authority -- by German magazine Sport Bild.
"That a man with such a sporting CV should be ridiculed as a 'Chefchen' in this way, is outrageous and an insult," said Bayern chairman Karl-Heinz Rummenigge.
"But the fact he ended up in this emotional situation with his over-the-top choice of words was not right and he knows this."
Schweinsteiger, who has played for Germany since 2004, lost his rag in Thursday's press conference when he turned on a Sport Bild reporter.
"I am not a Chefchen! It's a joke what you write, you don't understand anything about football, you should treat me with more respect," fumed the star as part of a long tirade.
Schweinsteiger had been annoyed by comments made by Robben that Bayern missed the leadership of former captain Mark van Bommel during key games under Munich's current skipper Philipp Lahm and Schweinsteiger.
Without mentioning the Dutch international by name, Schweinsteiger said: "I'm not a small captain, when I say something, everyone in the changing room listens to me."
Bayern face Schalke with the pressure mounting to finish in the top three and secure a Champions League place next season.
The Bavarian giants are fourth, a point behind third-placed Hanover, and Munich's director of sport Christian Nerlinger has backed the star.
"I appreciate him very much as a leader on the field and as a person," said Nerlinger.
"If Bayern are fourth in the table, it is normal that there will be some criticism.
"He will give the right answer on Saturday on the field."