Dave Kitson bemoaned the handball which killed Pompey’s Cup dreams.
Kitson insisted Chelsea’s opener in yesterday’s 4-0 defeat shouldn’t have stood.
Ashley Cole appeared to handle the ball after tussling with the striker before Juan Mata scored two minutes after the restart.
It proved the game’s key moment as the Blues’ brave resistance was punctured.
The home side then went on to score three goals in the final seven minutes to net a scoreline which flattered them.
Kitson was frustrated with the manner of that goal and insisted it was harsh on Pompey.
He said: ‘It was handball but referees unfortunately miss them sometimes. And sometimes those decisions mean you get punished.
‘It was harsh on us because we played well and were playing well up to that point.
‘To lose a goal in that manner is the most disappointing thing.
‘It was upsetting but they scored three other goals as well.’
Despite Cole’s handball proving key is swinging the game in Chelsea’s favour, Kitson believes Pompey couldn’t complain with defeat.
But the striker insisted there was a lot of positives to take from the game.
He felt there was plenty in the game to offer cause for optimism moving forward.
Kitson said: ‘We dug in pretty well for 85 minutes – but we switched off for the last five.
‘We only have ourselves to blame really. We can’t have any complaints about being defeated, although we gave a good account of ourselves.
‘We know in ourselves we were diligent in our work for 85 minutes, played when we could play and had chances.’