Contestants on BBC1's The Voice are trying to fight off a virus which has left them struggling to rehearse.
Frances Wood, Joelle Moses and Jaz Ellington have been struck down by the vomit bug this week.
All three are on Will.i.am's team, but others on the show are said to be worried about becoming ill before Saturday's heat.
Teams coached by Will and Sir Tom Jones will be taking part during this weekend's edition which will see four acts leave the competition.
The BBC said it was hoping the contestants would be fit to take part in the programme.
A spokesman said: "We're making sure the sick artists are getting all the rest and recuperation they need, and barring any further outbreaks, are confident they'll all make it back for Saturday night's show."
Last week's contestants in action...
Ruth-Ann St Luce (Team Jessie) - Promise This
Max Milner (Team Danny) - Freefallin', by Tom Petty, NOT John Mayer (whatever it may say in Google)
Toni Warne (Team Jessie) - belted out Tina Turner's <em>Proud Mary</em>
Hannah Berney (Team Danny) - Cry Me A River
Vince Kidd (Team Jessie) - Always On My Mind
David Julien (Team Danny) - Sweet Disposition
Cassius Henry (Team Jessie) - Paradise
Aleks Josh (Team Danny) - Dream A Little Dream
Becky Hill (Team Jessie) - Good Luck
Bo Bruce (Team Danny) - Running Up That Hill