Real Madrid coach Carlo Ancelotti urged cam after their shock 2-1 Champions League defeat at home to Sheriff Tiraspol.
The visitors jumped to a 1-0 lead, but a strong second half from Los Blancos, including a Karim Benzema penalty conversion, had everyone believing that the 13-time European champions would pull through.
But the match was turned on its head by a wonder goal from Sebastien Thill to secure the 2-1 win.
Ancelotti said: "We're feeling down rather than being worried because we had the chance to have got the three points. The team did its job and played with great intensity and commitment and the fine margins have ended up costing us the game. We had lots of chances and could have done better in the final 30 metres. It's difficult to explain the defeat when you look at the performance we put in.
“This could be a good lesson for the future. We're talking about a defeat when the team didn't deserve to lose, given how we performed. Sheriff defended really well and were tight at the back. We linked up well and broke through their backline many times and sent over many crosses. Where we let ourselves down was on the fine details. We've lost the game because we had a bit of bad luck."
Ancelotti was booked during the game and added: “It was something with the fourth official, because I felt he didn't show me enough respect. At the end, I told him that I'd managed 130 Champions League matches and it was the first time I had been booked for doing nothing. He told me I had gone onto the pitch, but the game had stopped because they were checking the VAR system.
"It's a lack of respect and I told him so and I also told the delegate. I don't want to speak about the refereeing."