The former Bionic Woman star plays Sally Bowles – the role made famous by Liza Minnelli in the 1972 film adaptation – in the show at London’s Savoy Theatre, which also features singer Will Young.
However, Ryan has been missing from the cast since Friday (14Dec12) due to health issues, and an employee at the venue told WENN on Thursday (20Dec12), “She’s off today. She’s off sick at the moment.”
It is unknown when Ryan will resume her role, with the worker adding, “We will just have to see about tomorrow and next week.”
A representative for the 28 year old refused to comment on rumours Ryan is suffering from laryngitis.