Waterford FC's appeal against a decision on player eligibility has been dismissed by the appeals committee of the Football Association of Ireland.
The Blues made the complaint to the FAI after Shane McEleney of Finn Harps was allowed to play the final game of the season.
McEleney was due to serve a suspension for the week of 9 November, but as matches were brought forward at late notice, the FAI ruled he could play.
The games were originally due to be played on 8 November but were pushed back to Monday.
The FAI advised that players due to be suspended from 9 November would received an amnesty.
Waterford issued a statement on 12 November saying a complaint had been registered with the FAI on the decision and they were presenting the matter to their legal team.
Had Waterford won their appeal, it could have led to the result of the Harps-Waterford game being altered to a victory for the Blues. Harps had won the game 1-0 on 9 November.
A change of result would have had a seismic impact on league placings, including putting Waterford ahead of Sligo Rovers in the crucial fourth position which has since resulted in European qualification for the Bit O’Red.
Furthermore, the relegation picture would also have been altered, with Harps and not Shelbourne eligible for the relegation play-off.
Shels lost the play-off to Longford Town last month.
However, today the FAI appeals body ruled against Waterford.
In a statement the FAI said: "The appeals committee of the Football Association of Ireland has ruled an appeal by Waterford FC against the disciplinary control unit of the FAI and Finn Harps out of order as per the FAI Rulebook.
"All parties to the appeal have been notified of this decision."
Waterford FC have yet to comment.