St Johnstone manager Steve Lomas was forced to cancel training on Thursday morning after a number of his players were hit with a virus.
The Saints were supposed to train at Stirling University but the session was called off after seven players went down with a bug.
"We've had to cancel training because there are six or seven players down with a bug," said Lomas.
"There's not much we can do about it, we will see how things are tonight and tomorrow."
St Johnstone will host Celtic in the Scottish Premier League on Saturday.