Slovan Bratislava's Champions League qualification tie at Faroe Islands side KI Klaksvik has been cancelled after a player from the Slovakian club tested positive for Covid-19.
The match was initially scheduled for last Wednesday but postponed to Friday after a member of Bratislava's delegation had returned a positive test, prompting local authorities to quarantine the entire team.
Bratislava, who knocked Dundalk out of the Europa League last year, were required to provide a list of additional players who had tested negative and were eligible to play the match.
However, a player from the second group returned two positive test results in consecutive days, forcing the entire group to be placed into quarantine, UEFA confirmed in a statement.
"The rescheduled match could not be played and the matter will now be submitted to the UEFA Control, Ethics and Disciplinary Body, for a decision to be taken in accordance with Annex I," UEFA said.
The Republic of Ireland are due to take on Slovakia on 8 October for their postponed Euro 2020 play-off semi-final.
Earlier this month, Kosovan side KF Drita's Champions League preliminary round tie against Northern Irish club Linfield was cancelled after two players tested positive. Linfield were subsequently awarded a 3-0 win and a bye.
FC Prishtina, also from Kosovo, opted to sign players on loan from rival teams for one match to contest a Europa League qualifier away to Lincoln Red Imps of Gibraltar after eight of their players had returned positive tests.