The GAA's Central Hearings Committee have upheld the two-match ban given to Neil McGee, meaning the Donegal defender will miss Saturday's Ulster semi-final clash with Monaghan.
McGee was sent off on a straight red card for a striking offence early in the second half of Donegal's recent victory over Fermanagh.
An initial one-match ban was doubled by the CCCC as it was the second time McGee received a suspension this year following an off-the-ball incident with Kerry's Alan Fitzgerald during this year's league.
The three-time All Star will therefore miss the clash with the Farney County and either a replay if game ends level, an Ulster final against Tyrone or Cavan, or a qualifier should Donegal lose.
It is understood that Donegal will not bring the case any further in terms of an appeal.
Meanwhile, TJ Reid has questioned whether Richie Hogan will win back his place in the Kilkenny team, even if he proves his fitness ahead of Sunday week's Leinster SHC final.
Hogan - Reid's predecessor as Hurler of the Year - missed the win over Dublin with a broken hand, though he has since had a cast removed and is expected to train fully with the rest of the Kilkenny team next week.
"Our six forwards hurled very well the last day so he'll have to fight for his place again, but that's just the nature of Kilkenny," Reid outlined.
"Just because we won so much, you can't be just brought back into the team. He'll have to be 100 per cent right before he's playing anyway, but he'll be a major boost to the team.
"He's back training and might be back (for the Leinster final). It's still 50/50," Reid added.
"He did break a bone in the hand that he holds the hurl with so there could be a lot of strength missing in the wrist, as well."