Aberdeen have had their claim of a wrongful sending-off rejected following goalkeeper Jamie Langfield's red card card against Kilmarnock.
The Scottish Football Association's fast-track tribunal upheld the 32-year-old's one-match suspension.
Langfield was dismissed by referee Craig Charleston in the final minute of the first half of Aberdeen's 2-0 defeat at Pittodrie.
It followed a challenge on Kilmarnock midfielder Borja in the penalty box.
Langfield will miss Saturday's visit by St Johnstone in the Scottish Premier League.
Aberdeen manager Craig Brown was disappointed that the SFA panel did not agree with those who did not think the goalkeeper denied a goalscoring opportunity.
"Every independent authority and, dare I say, all the media people said it was a penalty but it wasn't an ordering off," he said.
"Frankly, I didn't think it was a penalty either.
"The unfortunate thing is that the panel, having looked at it again on television and having read the referee's report and our submission, has decided that Jamie's suspension is continuing.
"We would not have appealed if we had not thought that it would be upheld."