Denmark coach Morten Olsen rued the late goal that denied his side a point as they lost 3-2 to Portugal on Wednesday.
Nicklas Bendtner's headed double looked to have salvaged the point the Danes needed to briefly go clear at the top of Group B.
But Silvestre Varela's 87th-minute strike dashed their hopes of a point and leaves them needing a result against Germany in their final Euro 2012 group game.
"It's a horrible feeling to lose so close to the end," said Olsen. "I was proud against Holland and proud of the way we fought back."
Portugal went 2-0 up through Pepe and Helder Postiga in the first half, after Denmark had started brightly but failed to capitalise.
"In the first 10 minutes we got into the game very well, we had a few corners but the quality was lacking a bit," Olsen added.
"The Portuguese took over the game without being that dangerous actually.
"Maybe they were a bit better, they had a few free runs - that was our mistake. I don't think they had the big chances."
Injuries to Niki Zimling and Dennis Rommedahl seemed to unsettle the Danes and the pair may now miss the game with Germany on Sunday.
"Our rhythm broke. Zimling is very important for our game and that was a turning point," Olsen said.
"We have a few injuries, but we'll pick it up before the game against Germany. We deserved a point."