Jose Mourinho's return to the Champions League with Chelsea started in dismal fashion as FC Basle came from behind to seal a stunning 2-1 win at Stamford Bridge on Wednesday.
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Mourinho's first spell at Chelsea came to an acrimonious end exactly six years ago when he was sacked following a lacklustre 1-1 draw against Rosenborg in the Champions League.
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And his hopes of erasing that painful memory with a win over Basle in his first match back with Chelsea in Europe's elite club competition since that night were dashed by a remarkable fightback from the Swiss champions.
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Brazilian midfielder Oscar had given Chelsea the lead just before halftime, but the Blues paid the price for a sloppy display featuring a host of missed chances as Mohamed Salah equalised after the break and Marco Streller bagged the winner with nine minutes remaining.
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"I'm not in shock. The reality is that sometimes you don't win. I'm not happy of course. We have taken a step back in qualification but we have five games left to finish in the top two," Mourinho said in the aftermath of Chelsea's first Champions League group stage home defeat since 2003.
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"Basle played very well. We had a lot of the ball but we couldn't create many chances. Emotionally this is not a mature team."
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Basle boss Murat Yakin added: "Congratulations to our team. We didn't come here to hide.
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"It is great to win, especially after conceding at a difficult moment."
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Mourinho has already overseen Chelsea's worst start to a Premier League season for a decade and, just five days after a 1-0 defeat at Everton, he has now suffered a second successive loss and one of the more embarrassing setbacks of his illustrious career.
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Blues owner Roman Abramovich was captured shaking his head as the fulltime whistle was greeted with boos from a section of the stunned home crowd.
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In truth, Chelsea, who have rarely been beaten at home under Mourinho, had never been anywhere near their best and could have few complaints.
It was a sad Wednesday night for all Chelsea fans!