Real Madrid head coach Carlo Ancelotti bemoaned one of the biggest upsets in Champions League history, the Italian believing his side did not deserve to lose to giant-slaying debutants Sheriff.
Sheriff caused a boilover at the Santiago Bernabeu, where the Champions League debutants and Moldovan visitors won 2-1 on Tuesday.
Jasurbek Yakhshiboev opened the scoring with a powerful header in the first half, before Karim Benzema's emphatic penalty levelled the scores for Madrid.
But Sebastien Thill rifled home a stunning effort from the edge of the box in the 89th minute to hand the Moldovan outfit a dramatic win in Madrid.
The result leaves Madrid second in Group D, three points behind Sheriff, who have won their first two games in the competition.
"More than worried, we're sad," Ancelotti said after the game. "We played with intensity and were looking good. We lost because of small details, even though the side played well. We could've been better when it came to the final third but it's tough to explain.
"It's small details that cost us this game. It's a lesson for us in the future as it's a defeat we didn't deserve. We had chances, we were creating out wide and [Luka] Jovic came on and had a couple of opportunities. I think that in the end, everything went well for them and bad for us.
"We've missed out on three points and the group is wide open. We need to win our next game."
Los Blancos star Casemiro lamented the team's defensive lapses and profligacy in front of goal on a humbling night for the La Liga leaders.
"That's football for you," Casemiro said after the full-time whistle. "One team has more than 20 shots on goal and plays well and the other team that comes here to defend and had two shots go and score twice.
"That's how things go in football and you've got to be more focused defensively. We fully dominated the game and had the chances to have made it 1-0, then 1-1 and they've ended up scoring a screamer."
Madrid face Shakhtar Donetsk away from home on October 19 in their next Champions League outing, where they will seek to right the wrongs of their defeat to Sheriff.
