Michael Appleton told his players they had only themselves to blame for last-ditch defeat at Cardiff.
The Blues were hit with a late, late sucker punch as they went down to a 3-2 loss with Craig Conway’s strike decisive.
Appleton feels the manner in which his men went to sleep for the home side’s second and third goals was key.
The Pompey boss refused to blame the obvious lack of options at his disposal, with just 13 fully fit senior players to call upon.
Appleton said: ‘I don’t like losing and I don’t like losing in the 93rd minute.
‘The annoying thing is we’ve switched off from a free-kick rather than it being cruel on us.
‘We switched off for the second and third goal.
‘When the ball comes dead you come alive. We didn’t do that.
‘The disappointing thing was we were in front in a game we didn’t deserve win. We were in a winning position.
‘We have 13 senior players fit, but I don’t want excuses. We have to crack on.’