Andy Awford felt his Pompey side paid the price for failing to carve out opportunities after their poor 1-0 defeat at AFC Wimbledon.
After falling behind early on, the Blues boss then saw his team struggle to make chances as they attempted to find a way back into the contest.
Awford said: ‘I’m disappointed.
‘We felt we could come here and take points from this game and we haven’t done that.
‘We conceded an early goal and it was another sloppy one.
‘We conceded two sloppy goals the other night against Cheltenham and we’ve conceded another sloppy goal.
‘It’s a goal that should be stopped.
‘It was an open first half. But Paul Jones didn’t have too much to do and neither did their keeper.
‘But I’ve spoken to the players and we’ve got to do more with the amount of possession that we have.
‘We’re disappointed with the lack of chances we have created.
‘We’ve scored a few lately but this time, it didn’t go for us.
‘We’ve got to do better.’