Leicester City's UEFA Youth League hopes suffered a hammer blow as Morten Hjulmand struck in stoppage time to hand Copenhagen a dramatic victory.
The late loss means Steve Beaglehole's young Foxes side have taken just three points from a possible 12 and sit bottom of the Group G standings with two matches to go.
They can still advance to the knockout phase, but would have to beat both Club Bruges and Porto, while hoping that other results go their way.
Leicester had already shown great resiliance to fight back from two early goals by Julian Kristoffersen - who struck after just 10 seconds - and Nicklas Rojkjaer.