David Casey has lost his appeal over the two-day ban he received at Thurles last Thursday.
Casey was suspended for two days for failing to pull up his mount Alcapone, first past the post in the Heineken Phil Sweeney Memorial Chase, after it had gone the wrong side of a marker.
Having considered the evidence, the Appeals and Referrals Committee of the Irish Turf Club dismissed the appeal.
They also allowed the severe cautions given to Barry Geraghty, Conor O'Dwyer, Neil Mulholland and Denis Leahy in the same race to stand.
The riders received the caution for failing to familiarise themselves with the course.
The quartet had also gone the wrong side of the marker but turned back when they discovered the error.
Geraghty's mount Delphi Mount eventually finished second, a distance behind Alcapone, and was awarded the race at a stewards' inquiry.