Toulon president Bernard Lemaitre has launched a scathing attack on the European Professional Club Rugby and threatened to boycott the Champions Cup after a positive Covid-19 test saw Leinster handed a walkover victory against his side.
The controversy left the three-time champions from France furious as their president threatened to pull his club out of future European events.
"We are treated like a Kleenex," said Lemaitre.
In a statement, organisers EPCR said that as Toulon were unable to field a team, the French club had forfeited the game.
Before setting off for Ireland, Toulon reported a Covid-19 positive for a front row player who did not travel. The club said it carried out further tests on Thursday, all of which were negative.
Toulon accused EPCR of "errors" for allowing "the players and staff to travel to Ireland, prepare for the match, only to have them prevented from taking part in this major event a few hours before kick-off."
"The Rugby Club Toulon strongly deplores this decision," the statement said.
"There is anger and disgust," Lemaitre said. "I am not at all sure that RCT will re-enter the European Cup."
There was little time for a rearranged match, with the winner due to meet either Lyon or 2020 champions Exeter Chiefs in the quarter-finals next weekend.
Toulon said the organisers had offered to postpone "the match to Sunday on condition that all six front row players", the three starters and three substitutes, were replaced.
But this was a "clear sporting impossibility" said the club.
Earlier, Toulon's veteran Italian forward Sergio Parisse seemed to suggest on Twitter that all French clubs should boycott the competition, writing: "We will see if we ALL show solidarity of not" followed by a French flag and a no-entry sign.
Lemaitre said he thought that unlikely.
"All the players are furious," he said. "But Sergio Parisse's request is not realistic. I've received a lot of nice messages, from the new president of the (French) league and from presidents of the clubs but I don't think I can ask them to boycott the European Cup.
"But it is possible that RCT will do it."
Lemaitre said the trip had cost his club "more than €250,000, with the travel and hotels" and said he was thinking of demanding compensation from EPCR.