Portsmouth's Sylvain Distin and Niko Kranjcar have questioned their team's desire, with Frenchman Distin saying: "We expected to win and we were expected to show some more determination than this, but the way we started was sloppy.
"We failed and it is difficult to explain why that's the case. I don't know, but it hurts to concede two goals. Even letting in one is too much for me.
"The idea is to keep a clean sheet. If you concede two goals you have to score three to win, and that is difficult."
Kranjcar, impressive again despite defeat, admitted: "David (Nugent) had a wonderful opportunity and if he had scored I think we would have gone on to win.
"But the first half was the part of the game that really lost us the match. That was the main problem.
"We had some better movement in the second half after the substitutions and we should have been the team to score the next goal.
"Unfortunately they got it, and after that we almost gave up."