Football Association of Wales member and former secretary Alun Evans says the rejection of Wales' appeal against Russia is "inaccurate and immoral".
"There's no question that the Russians cheated and that Uefa's hearing was a PR exercise," said Evans.
Uefa decided that Russia's Euro 2004 play-off win against Wales will stand despite Egor Titov's failed drug test.
The FAW have until midnight on Friday (6 February) to decide whether to appeal against the decision.
They are understood to be taking legal advice and will not release a statement until Friday.
Evans is in no doubt that Wales should take the case to a second hearing and, if necessary, to a European court of sports arbitration.
"I hope we don't give up now," Evans told BBC Radio Wales' Midweek Sport programme.
"Common sense hasn't prevailed, immorality has prevailed.
"The statement made by Uefa and the grounds given are not even accurate, they haven't deigned to give us a proper hearing."
Meanwhile Wales defender Darren Barnard, who played in both play-off games against the Russians, has raised questions about the drug testing process which caught Titov.
"I was part of the drugs testing after the first game along with Nathan Blake," Barnard told BBC Sport Wales.
"It was strange because at no point did we see Titov in the room, although we saw the other Russian players.
"It's disappointing to have the ruling go against us, but I expect the FAW to take the appeal all the way.
"It's a long shot, but we will try every avenue and could still make Euro 2004."