Defender felt Pompey should have stuck to original game-plan
Joe Devera felt that Pompey lost their composure at Cheltenham.
Goals from Patrick Agyemang and Johnny Ertl meant the Blues were leading as the game headed into stoppage-time.
But Jermaine McGlashan struck at the death to deny Pompey a first away league triumph of the season.
And Devera believes that the Blues should have kept playing the slick passing game that had served them so well for much of the match.
The defender said: “We played well for long periods and worked hard – I think we deserved to take all three points.
“But I think we stopped playing and just started to boot the ball which played into Cheltenham’s hands.
“We could have seen the game out and we should have seen it out, but we lost our composure towards the end.
“We conceded quite a few fouls and that meant we were put under the cosh a bit. They played to their strengths and got a goal at the end.
“If you look back at the game, I think they only had two good opportunities and they scored from them both. I can’t remember our keeper having to make a save.
“Everyone was disappointed and I think we’ll look at the goals and the mistakes on Monday and then work from there.”
Four of Pompey’s back five at Cheltenham were summer arrivals and Devera believes they are still gelling as a unit.
He said: “It’s improving game by game, but there’s still a lot of work to be done. We’ve looked solid, but then conceded silly goals.”