Pompey produced a lively performance towards the end their clash with promotion rivals Charlton at The Valley.
Unfortunately, they were 2-1 down at that point and were unable to find a late leveller to leave London with a point.
Lyle Taylor grabbed the winner early in the second half after Joe Aribo’s opener had been cancelled out by a thumping Ronan Curtis header.
And Christian Burgess was frustrated that despite applying plenty of late pressure, the Blues could not make it count.
The defender said: “It’s disappointing to lose a game of football between two good sides and it was fairly open with a lot of chances.
"Maybe it was a bit too late, but there were still the chances there for us to get something from the game."
“Unfortunately, we just fell short after creating some decent opportunities when we got going in the last 20 minutes.
“Maybe it was a bit too late, but there were still the chances there for us to get something from the game. Football is all about those fine margins and congratulations to Charlton.
“We were quite confident at the break and thought we’d come out stronger for the second half, like we have done recently.
“There was belief in the boys and we’d highlighted the areas where they were getting in and causing us some problems.
“But I don’t think it was one of my best games, so I’ll watch it back and assess things to see where I can improve.”
With Pompey sitting fourth and the Addicks one place below them, the teams could end up facing each other in the play-offs.
Burgess said: “There are 10 games to go now and we could obviously meet Charlton again, although it was a bit of a dent for us.
“We’ve got 30 points to play for and I don’t think you can write us off, but you expect to face good teams when you’re trying to reach the Championship.”