Ten bus services could be facing cancellation today.
Bus Vannin says driver illness means services could be affected between around 4.30pm and just after 11pm tonight.
They include routes between Douglas and Port Erin, Noble's Hospital, Anagh Coar, Onchan and Willaston.
A further nine services which had been at risk will now run today.
Manxman sailings in doubt from tomorrow
Car falls down steep bank on Mountain Road
Panic over - Mcdonald's reopens at 11am tomorrow
Police say beat it to cars illegally parked during MJ tribute act
No dedicated prostate cancer screening programme, despite over 1,200 referrals
Minister says GP waiting times have improved, but delays still impact A&E
Crash closes section of the Mountain Road
Island's prison nears full capacity