Brendan Cole will be missing from Strictly Come Dancing on Saturday night due to illness, the show has said.
The professional dancer, who is partnered with Anastacia, has been suffering with a lung infection and missed rehearsals this week after being admitted to hospital.
Anastacia will dance instead with Gorka Marquez, who has been working with the singer on the routine, a quickstep to Frank Sinatra's My Kind Of Town.
The BBC dismissed reports that other professional dancers were affected by a virus although confirmed Katya Jones had lost her her voice, which is said to be on the mend.
The show said Cole was sitting out on doctor's orders.
A statement said: "Brendan Cole is recovering from a lung infection and he has been advised to rest and will not be dancing this weekend as per doctor's orders.
"Gorka Marquez stepped in at the start of the week to rehearse with Anastacia and they will dance together on the show this weekend.
"We wish Brendan a speedy recovery."
The New Zealand-born dancer took himself to hospital hours before performing on last week's show after coming down with a bad cough, which he feared was a recurrence of the pneumonia he suffered earlier in the year.
Following his late night at the hospital, Cole appeared on the show and successfully danced a rumba as planned, making it through to another week in the competition.
Viewers of Saturday night's show will be given a glimpse of a bronzed-up Ed Balls after the former Labour MP underwent a spray tan on Friday afternoon.
The ex-shadow chancellor called the experience the weirdest thing he had done since getting a "naked Balinese massage" on his honeymoon.
Mr Balls, who last week scored a series low of 16, will dance the American smooth to (Is This The Way To) Amarillo by Tony Christie with partner Jones.
Meanwhile sports presenter Ore Oduba and partner Joanne Clifton will be dancing waltz to the Claudia Streza version of I Will Always Love You after their almost perfect 39 last week.