The club have called it "a serious error of judgement."
Dundalk have confirmed that their entire squad have since returned negative results from COVID-19 tests.
The Lilywhites' match against Finn Harps on Friday will go ahead as planned following consultation with the H-S-E.

Ireland Star Aoife Wafer Set To Make Her Debut For Harlequins This Weekend
Declan Rice Among The Absentees For Arsenal This Evening
Wednesday Morning Sports Update
Celtic Legend John 'Dixie' Deans Has Died
Craig Casey Signs Two Year Contract Extension With Munster
Today's Fixture At Punchestown Cancelled Due To Storm Bram
Tuesday Morning Sports Update
Former Jockey Rachael Blackmore Receives Contribution To The Industry Award At 2025 Horse Racing Ireland Awards