Portsmouth manager John Mousinho spoke to BBC Radio Solent after Saturday's 1-0 defeat by Sheffield United.
"Any loss is difficult to take, but the nature of the goal conceded and the way the game panned out makes it really difficult," he said.
"The games where you come away and know you are not the better side, there are concerns when that happens and you can think 'we weren't at it today or not good enough'. But I thought we were the better side today and should have won the game.
"The opportunities that were created and some of chances we carved out were excellent, but we didn't show enough composure and ruthlessness in those moments."
"For a very dominant first-half display, we didn't come in with a goal. That's fine it happens, but it was about building on that in the second half and we probably didn't do that until the last 25 minutes when we settled into the game again and had a few opportunities.
"But ultimately we got caught in the end."