Denmark coach Morten Olsen described his side's performance in Saturday night's World Cup 2-1 victory over Cameroon as "heroic" but admits they will need to improve massively if they are to make any further progress in the tournament.

Samuel Eto'o had put Cameroon ahead but Denmark drew level thanks to Nicklas Bendtner before Dennis Rommedahl snatched the win.

"We had far too many elementary mistakes that we made and we can't allow that from our players," Olsen said. "We must correct that, so I wasn't happy actually. Of course the players fought heroically, some of them didn't play well I have to say, but they fought."