Antoine Griezmann's controversial first-half penalty handed Atletico Madrid a tight 1-0 win over gutsy Leicester in their Champions League quarter-final first leg.
The France striker was fouled outside the box by Marc Albrighton but referee Jonas Erikssson pointed to the spot - yet the Foxes' European hopes remain alive.
It was deja vu for Leicester after another dubious penalty at the Vicente Calderon helped knock them out of the UEFA Cup in 1997.
They will also have to overturn a deficit at the King Power Stadium on Tuesday without Robert Huth, who is suspended after collecting his third booking of the campaign.