Bayern Munich's club doctor Hans-Wilhelm Muller-Wohlfahrt has resigned with immediate effect after almost four decades at the club.
Muller-Wohlfahrt, also the doctor of the Germany national team for several decades, said in a statement that the "relationship of trust has been damaged" as he and three of his assistants left the record German champions.
The 72-year-old felt his team had been "made responsible for the defeat (to Porto) for inexplicable reasons," sport1.de reported.
Bayern were without five key players for the 3-1 defeat in Portugal with Franck Ribery, Arjen Robben, David Alaba, Bastian Schweinsteiger and Javi Martinez all currently sidelined.
Coach Pep Guardiola is understood not to be completely satisfied with Dr Muller-Wohlfahrt's work, although he has not publicly pointed the finger at him.
Last year, Guardiola advised Thiago Alcantara to seek treatment in Spain at his own preferred doctor rather than follow Dr Muller-Wohlfahrt's advice.
Bayern Munich inflicted another massive defeat on Hamburg at the Allianz Arena to remain on course to retain the title in Germany.
Two years after thrashing Hamburg 9-2 at home, Bayern went goal crazy again as braces from Thomas Muller, Arjen Robben and Mario Gotze plus strikes from Robert Lewandowski and Franck Ribery saw the reigning champions run out 8-0 winners.
The victory keeps Bayern eight points clear at the top of the Bundesliga.
Wolfsburg boosted their hopes of catching Bayern Munich at the top of the Bundesliga by inflicting the defending champions' first league defeat this season in some style on Friday night.
Bas Dost and Kevin De Bruyne grabbed a brace each as Wolfsburg romped to a fully deserved 4-1 win over Pep Guardiola's men, whose consolation was netted by Juan Bernat.
Wolfsburg's spectacular win reduces their arrears on Bayern at the top of the table to eight points as the Bavarians conceded as many on one night as they had done in the entire first half of the season.
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Bayern Munich manager Pep Guardiola continues to stamp his style down at the club with this impressive one touch passing drill.
Bayern Munich midfielder Xabi Alonso admits it's in Bayern Munich's interest to knock Man City out of the Champions League, even though the German champions have already qualified from their group.
Bayern take on City at the Etihad tonight knowing that victory will send the Premier League champions crashing out of Europe, while City must win to stand a chance of avoiding the embarrassment of a third group stage elimination in four years.
When asked by ITV Football's Gabriel Clarke whether it was in Bayern's interests to make sure City are eliminated tonight, former Liverpool midfielder Alonso said:
"Well, of course, if they go through, I think they have a good enough squad to beat any team in Europe for sure.
"If they have two good games they can beat any team, because they have great players."
Bayern Munich have suffered a huge blow with the news captain Philipp Lahm will be out of action for up to three months after breaking his ankle on Tuesday.
The former Germany skipper was driven away from the training ground on a cart after going over on his right ankle while training with the Bavarian giants.
Subsequent tests have shown that the 31-year-old full-back will need to to undergo an operation which is likely to sideline him until well after the new year.
A group of 55 Bayern Munich fans determined to watch their team's match in Moscow last night paid £5,400 for a high-rise office space overlooking the Luzhniki Stadium.
They were joined by reserve team player Tobias Scweinsteiger, who tweeted the image below, explaining: "Where there's a will, there's a way."
UEFA forced CSKA Moscow to play the Champions League match behind closed doors as punishment for racist chants by their fans during a match against Viktoria Plzen in December 2013.
The opportunistic group were rewarded for their troubles after Bayern collected all three points in a closely fought contest, thanks to Thomas Muller's first half penalty.
Bayern Munich Chairman Karl-Heinz Rummenigge was unaware the supporters had paid to rent the office space, but later agreed to cover all costs.
"This was not known to us and my colleague Jan Dreesen has indeed paid the rent for the game," he confirmed.
Manchester United fans have descended on the city centre of Munich in Germany ahead of tonight's Champions League clash against FC Bayern Munich.
A German court has sentenced Bayern Munich's president Uli Hoeness to three and half years in jail for tax evasion.
Prosecutors had argued that Hoeness's voluntary disclosure - that he had failed to pay taxes - was incomplete and thus did not meet a vital requirement needed for amnesty under German tax laws designed to encourage tax evaders to come clean.
Hoeness has admitted he evaded 27.2 million euros in taxes on income earned in secret Swiss bank accounts.
The 62-year-old football manager was hoping for leniency in one of the most closely watched tax evasion cases in German history.