Wycombe Wanderers manager Gareth Ainsworth believes Portsmouth were gifted a soft penalty as the Chairboys sank to a 1-0 defeat at Adams Park.
Ryan Taylor's penalty early in the second half after defender Gary Doherty was adjudged to have brought down Wes Fogden was enough to down Wycombe.
A series of fine saves from Pompey goalkeeper Trevor Carson had kept Wycombe at bay before the ball was cleared off the Bury loanee's line several times in one goalmouth scramble after the break.
And Ainsworth insists Fodgen's reaction after the penalty incident was telling as the midfielder appeared not to make any signs of protest to referee Charles Breakspear.
"It was the softest penalty you have ever seen, I don't think any Portsmouth player appealed for the penalty, but he just seemed to give it," said Ainsworth, whose side are winless in 2014.
"I disagree with the decision, but I can't question anything else, he's the referee and he can only see what he sees on the pitch.
"That was their only shot on goal and they scored it. The difference is they put their chance in the back of the net, and in fact we did as well, again I question that decision.
"I thought the ball went into the back of the net, on the goal-line, but if it looks out, it's out."
Carson twice made stops from Matt McClure in the first half before making a stunning reflex save to deny Chairboys home debutant Reece Styche.
The goalkeeper had made a blunder in Pompey's 2-2 draw against Morecambe on Saturday, and boss Richie Barker insists the 25-year-old remains a part of his plans while admitting his side rode their luck at times.
"I haven't had chance to ask (Wes Fogden), but I must admit that from where I was it looked like a penalty," said Barker.
"I heard their bench saying it didn't look like there were too many appeals, but I've seen them given, and a couple of weeks ago we had one similar where Jake Jervis didn't get it.
"Trevor Carson pulled off a couple of very good saves, and he was safe for us, he certainly put himself back into being a part of what we're doing.
"It took a little bit of luck, we've not had any since I came but at times you make your own luck with the ability to throw yourselves into defending as well as we did.
"Would not winning have been the end of the world? No, not really and there's still a long way to go, it's obviously nice, it's another clean sheet and we've got three points."