Dundalk's preparations for their FAI Cup quarter-final replay against Finn Harps in Oriel Park on Tuesday night have been dealt a huge blow following a case of Covid-19 in the Louth club's camp.
It is understood that as of Monday afternoon one player had tested positive, with fears of more positive results once tests which took place this morning to determine whether they can play in the tie are returned.
While the Cup holders await to see how many players they have available for the game, the FAI have been made aware of the situation as per protocols.
It is unlikely the game will be postponed with league rules stating that a game must go ahead if a club has 14 fit and available players, and the fixture is conceded if they don't have those numbers.
This is the second outbreak of Covid-19 at Dundalk in the last three months with three players missing the Europa Conference League first qualifying round tie with Newtown in July.
With the FAI Cup looking like the Lilywhites' best route to Europe, it is also a huge blow to their SSE Airtricity League Premier Division survival hopes, with games against Sligo Rovers and Bohemians to follow at Oriel Park on Friday and Monday respectively.
Dundalk currently sit ninth in the table in the promotion/relegation play-off spot having taken just one point from their last six games.
The Covid-19 outbreak comes at a time when Vinny Perth's side are already without several players through injury.
Brian Gartland, Cameron Yates, Patrick McEleney, David McMillan, Wilfried Zahibo and Daniel Kelly have all been missing of late while Han Jeong-woo will also miss Tuesday's replay due to suspension.
Dundalk, who beat Shamrock Rovers in last December's final, looked like they were destined to reach the last four of the Cup for the eighth time in nine seasons on Friday when they led 10 men Finn Harps 3-1 with six minutes to play.
However substitute Sean Boyd rescued a replay for Ollie Horgan's men with a superb late double, including a 95th minute equaliser to keep their own Cup ambitions alive.