Portsmouth manager Steve Cotterill hit out at the match officials after his side went down 4-1 at Crystal Palace.
With the game all-square at 1-1, David Nugent thought he had put Pompey ahead after the break but was denied by an offside flag.
Moments later hat-trick hero James Vaughan restored Palace's lead when he raced onto a long ball and lobbed Jamie Ashdown, amid further suspicions of offside.
"There were two decisions that I can't see how the referee and linesman came to them," Cotterill fumed.
"I've just been told Nugent's goal was onside, and two minutes later their goal is blatantly offside. They go 2-1 up and have a spring in their step. And before that we were the better team.
"What's the point speaking to the referee? You end up getting fined and they laugh at you so what's the point?"
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