Saracens' participation in the Heineken Champions Cup quarter-final against Leinster is in doubt pending an EPCR hearing.
Tickets for the Aviva Stadium match went on sale yesterday, but the European champions may be replaced by Glasgow Warriors if they are found guilty of fielding an ineligible player in their final pool game against Racing 92.
The club informed the organisers that prop Titi Lamositele, who came off the bench in their narrow win over the Parisians, may have been ineligible due to an administrative error.
While the USA international was registered, his work permit expired the day before the match. This, according to an EPCR statement, may have constituted a breach of the tournament's disciplinary rules.
The hearing takes place this evening and a result is expected tonight.
The error came during a chaotic weekend for the London club who were informed that they would be relegated from the top-flight of English rugby as a result of their salary cap breaches.
Now, they may be ejected from the Champions Cup if the disciplinary committee consisting of Welshman Roger Morris, Scottish woman Pamela Woodman and Frenchman Jean-Noel Courad find them guilty and opt for expulsion or a points deduction.
Alternatively, they could fine or warn the club about their future conduct if they are found guilty.
In 2000, French club Agen were docked four points for fielding an ineligible player in the European Shield, allowing London Irish progress to the quarter-finals of the competition. Months later, then organisers ERC docked London Irish two points for a similar offence. Either punishment would see Sarries lose out.
If that was repeated, Scottish club Glasgow Warriors would be next in line to face Leinster on April 4.