Kenny Jackett was unhappy with Pompey’s defending following their 2-2 draw with Burton at Fratton Park.
Oli Hawkins had headed the hosts into an interval lead, only for goals from Jake Hesketh and Devante Cole to turn the contest on its head early in the second half.
That snapped them back into life, though, and Matt Clarke converted Gareth Evans’ corner to level the scores.
Neither side was able to find a crucial third, though, and Jackett felt his side could have been stronger at the back.
The Blues boss said: “We’re disappointed with the goals we conceded – particularly the second one which was soft.
“Hesketh went past three or four of our players far too easily and seemed to wriggle out of situations before putting it into the net.
"We’ve been better than that and shouldn’t give teams easy opportunities."
“We didn’t track the runner down in the right channel for the first one and Cole was able to finish without any challenge.
“We’ve been better than that and shouldn’t give teams easy opportunities because there is some Championship quality at Burton.
“It was a good response to falling behind, though, and we deservedly got level, although most of the time it just wouldn’t fall for us in the box.
“We got a lot of balls in there from out wide and applied plenty of pressure with some good moves, but couldn’t quite find a winner.”
The sponsors named Ben Thompson man-of-the-match for the second game in a row, with the on-loan Millwall star producing another impressive display.
Jackett said: “As an all-round midfielder, he’s got a very constructive game and we feel he’s built a strong partnership with Tom Naylor.
“He’s adapted quickly to joining a new club and has been able to establish himself in our side in recent weeks.”
Dion Donohue went off midway through the first half with a hamstring problem, while Hawkins also had to be withdrawn.
And a fifth league booking of the season means that Naylor will miss Pompey’s trip to Accrington at the weekend.
Jackett said: “Oli rolled his ankle in the first half, so we brought Brett Pitman on for some fresh legs and I thought he linked the play well.
“I don’t know how bad Dion’s injury is and he put in some excellent deliveries in the first half-hour. That left foot is an asset.
“He has to make sure that his body is battle hardened and fully ready for when he is able to come back.
“Tom’s been a big player for us, but you can’t rely on one person and we have a lot of midfielders, so someone will come in with fresh energy.”