Marc Albrighton believes referee Jonas Eriksson cost Leicester City a positive result last night.
The Foxes winger was penalised for a foul on Antoine Griezmann on the edge of the area in the first half of the Champions League quarter-final first leg against Atletico Madrid.
Swedish match official Eriksson pointed to the spot which allowed Griezmann to step up and convert from the spot, much to the dismay of the reigning Premier League champions who eventually lost 1-0.
Albrighton said of the questionable decision: "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.
"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 has 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."