The telly host had to pull out of yesterday’s run through to go home and rest after picking up a winter bug, the Irish Independent report.
Producers are hoping that Sir Brucie will be well enough to go through with the live show tonight, but have been making back up plans if he can’t continue.
A “programme source” told the newspaper: “We’re pretty sure he will be back to do the show.”
Bruce previously missed one live show this series back in November, with Claudia Winklemen stepping in to host alongside Tess Daly.
Before that, Bruce has only ever been absent once due to illness, back in 2009.
Five couples remain in the competition and this weekend will see one axed just before the final.
Lisa Riley, Denise Van Outen, Dani Harmer, Louis Smith and Kimberley Walsh will all be dancing two routines each in order to make the final, where four couples will compete for the first time in Strictly history.
Strictly Come Dancing continues this weekend with the semi-finals on Saturday 15th December at 6.30pm with the results show on Sunday 16th December at 7.30pm on BBC One and BBC One HD.