Craig Shakespeare and Marc Albrighton both told referee Jonas Eriksson he got the disputed penalty wrong, after their bitterly frustrating Champions League defeat.
Eriksson infuriated Leicester’s manager and players by awarding a spot-kick for a foul by Albrighton on Atlético Madrid’s Antoine Griezmann, though television replays showed the contact was outside the area.
Griezmann put away the penalty to give Atlético a slim advantage going into the second leg, on a night when at least two supporters were arrested after clashes with police before kick-off.
And Shakespeare, the manager, made a renewed call for video evidence after Swedish official Eriksson’s controversial decision.
“It was a major decision. I told him he got the decision wrong. We’re talking about a Champions League quarter-final. This major decision could cost us the game,” he said.
“It wasn’t a penalty. It was a free-kick. It’s a really disappointing decision by the referee. He has to get that one right. You can’t guess on those ones.
“The referee has a hard job. We know that. But it’s the key decisions that you want correct. We’ve got so much technology available to us now that I find it strange we can’t be offering help to officials with video evidence.”
Albrighton was also critical of Eriksson. “I asked the ref about the decision after the game and he said the foul was on the line. That’s his verdict on it but TV replays have shown it was outside,” he said.
“It was a clumsy challenge but my first thought was to not let him in the box. The final decision lies with the referee and it’s cost us. We can’t afford to dwell on it and we have to put it out of our minds as soon as possible. We’ve just got to move on although it’s taken the gloss off it a little bit.”
Despite Eriksson’s controversial moment, Leicester still have a genuine chance of reaching the semi-finals ahead of Tuesday’s second leg.
Leicester did not manage a shot on target while Jamie Vardy only attempted two passes all evening.
Robert Huth was also booked, ruling him out of the rematch, but Shakespeare insists Leicester’s European adventure remains alive.
“We want to stay in the competition, but we know we still have a challenge ahead against a very good team,” he said.
“We know it’s still going to be a very difficult return match. We have a very good record at the King Power, our fans enjoy these Champions League nights. We have to make sure that we create more chances, we have to make sure that we attack a bit more than we did tonight. We’re aware of what we’ve got to do in the second leg.”
On the trouble before the game, Shakespeare said: “I’m aware of it, I haven’t seen anything and until the club makes a statement, I think it’s best if I stick to the football.”
Eight Leicester fans were arrested in the Plaza Mayor square on Tuesday and there were ugly scenes in the same venue hours before the game.
Videos on social media appeared to show a minority of Leicester fans taunting Spanish locals by singing songs about Gibraltar and another celebrating the shooting down of German planes by the RAF.
The eight Leicester fans arrested in the Plaza Mayor on Tuesday were being questioned by police on Wednesday, and are expected to be brought before Madrid courts on Thursday.