Three other Kilmarnock players have tested positive for Covid-19, bringing the number of cases at the Scottish Premiership club to six.
All six are self-isolated and Friday’s Scottish Premiership visit to Motherwell is now in doubt.
The SPFL is awaiting information from the Ayrshire and Arran Health Board Test and Protect team before “determining the implications”.
Earlier Thursday, manager Alex Dyer said his team were “in limbo”.
After three players had their positive tests from the start of the week confirmed by the NHS, Kilmarnock was unable to train until the results of a new batch of tests on Thursday were known.
Dyer said one of the top three players felt bad on Sunday after the victory at St Mirren the day before and was not allowed to train. The other two were asymptomatic.
“We thought it was just a bug because of the weather change, and then we found out that three players had tested positive,” he explained.
“We won’t feel sorry for ourselves – it’s part of life. We will train when we have the right to and do what we can. If they let us play, we’ll do our best. ”
The trio that returned positive tests on Thursday will now also have NHS tests.
“The health and well-being of our players and staff remains paramount and we wish everyone affected a speedy recovery,” said Kilmarnock.
UEFA’s guideline, to which Scottish Football’s Joint Response Group adheres, is that any team with 13 available players – including a goalkeeper – should complete their match.