The Denmark attacker was highly critical of his side's defensive display in Turin, as it conceded two penalties, both of which were converted by hat trick hero Arturo Vidal.
Copenhagen forward Nicolai Jorgensen could not hide his frustration after his side's hopes of making the last 16 of the Champions League were ended by a 3-1 defeat at Juventus.
The Danes fell behind 29 minutes in when Arturo Vidal converted a penalty after Lars Jacobsen had inexplicably handled in the area but they drew level early in the second half through Olof Mellberg.
However, FCK shot itself in the foot once more when Mellberg hauled down Fernando Llorente in the area and Vidal slotted home once more before adding a header moments later to seal victory for the hosts and send the visitors crashing out.
"I feel quite bitter right now," Jorgensen told reporters after the game. "I'm annoyed by the defensive mistakes. I feel that we could have got more out of this match.
"We could have got at least a point. We created too few opportunities as well."
Copenhagen will at least go into its final game, against Real Madrid on December 10, knowing that a victory would secure it a place in the Europa League.