Leinster have said they are disappointed at being told they must forfeit Friday's Champions Cup game against Montpellier and that they had the necessary personnel to play the fixture.
Both clubs were hit by fresh COVID-19 cases ahead of the tie and European Professional Club Rugby (EPCR) announced the game could not go ahead safely, with the French club awarded a 28-0 win and five match points.
"Leinster Rugby's team management has expressed its disappointment with EPCR over the decision to award a 28-0 win in Montpellier's favour," the club said in a statement.
"Squad and staff have had five rounds of antigen tests and four rounds of PCR tests in the last six days and a group ... had been selected to represent the club in France tomorrow evening and arrangements made accordingly."
(Reporting by Aadi Nair in Bengaluru; Editing by Peter Rutherford)