Manchester City's Champions League campaign did not get off to an ideal start.
Pep Guardiola was forced to watch from the stands as his side suffered a 2-1 defeat at home to Lyon.
There were several familiar faces who played their part for the visitors, Liverpool target Nabil Fekir scoring what proved to be the crucial goal.
To make matters worse, ex-Manchester United duo Rafael da Silva and Memphis Depay both took delight in undoing their former rivals.
The Brazilian defender suggested that City may have underestimated the Ligue 1 outfit.
"Everybody knows I'm a United supporter. To come here to win at City – I've never lost here – is very good for me," he said, via Goal.
"We know that if we play together we have a chance against any team. We have quality players, as you saw. We just need to play like this more often and results will come.
"I don't know if they underestimated us. We played well. We had more chances to score goals. Maybe they thought… we are not very good in Ligue 1, you know. We're not playing very good football.
"Maybe they looked at the videos and said 'well, they don't have good confidence'. I think we played really well."
Memphis' message for City
Indeed, Lyon have won just two of their five domestic games this season, which makes the result all the more troubling for City.
And to further rub salt in the wounds, Memphis took to Instagram with the message, 'Manchester is still red'.
Premier League fans will recall that the Dutchman didn't exactly have the most successful spell at Old Trafford.
Despite being one of the many players dubbed 'the next Cristiano Ronaldo', the 24-year-old struggled to make an impact under Louis van Gaal and ultimately became a fringe player.
Had United fans been able to see him in action at the Etihad, however, they would have been impressed, the forward providing the assist for Fekir and creating a few good chances himself, only to be denied by Ederson.
"It is a big result. I am proud of the team," he told BT Sport after the final whistle, per the Manchester Evening News.
"It was a difficult game but when we had the ball we tried to play and when we won the ball we tried to counter-attack. We have a good team and tonight we showed that we can definitely go through from this group stage."