Linfield, the reigning champions of Danske Bank Premiership, confirmed on Tuesday evening that a member of their squad had tested positive for COVID-19.
"Linfield FC can confirm that one of our players has tested positive for coronavirus," the league leaders announced on their website.
"This club is taking advice from the relevant authorities and will provide an update when we have further details."
Club chairman Roy McGivern also issued a tweet this evening, describing the news as "unpleasant".
"Very unpleasant news that one of our players has tested positive for Covid-19. The priority now is to look out for the welfare of our players and staff. Issues around football will be addressed in due course."
Very unpleasant news that one of our players has tested positive for Covid-19. The priority now is to look after the welfare of our players and staff. Issues around football will be addressed in due course.— Roy McGivern (@RoyMcGIvern) March 10, 2020
The IFA issued a statement this evening saying they would conduct a "deep clean" of the facilities at Windsor Park.
"Having been made aware that an individual, who recently used some of the facilities at the National Football Stadium at Windsor Park, has subsequently tested positive for Covid-19, the Irish FA has taken the decision to conduct a deep clean of the premises with immediate effect as a precautionary measure.
"We have instructed staff members to work from home for the next 48 hours and will continue to update them, as well as our partners based at the stadium, regularly."