Tony Bennett canceled his London show on Tuesday with Lady Gaga due to a flu virus.
The 88-year-old singer apologized to his U.K. fans on social media. A statement from his publicist said ticket holders should "retain their tickets to this event pending more information."
Concert promoter Live Nation confirmed the canceled performance at the Royal Albert Hall. The duo also performed Monday in London.
Gaga and Bennett won a Grammy this year for their collaborative album, "Cheek to Cheek."
The duo's website says their next show is scheduled for Saturday in Paradise Island, Bahamas. They will perform four shows at New York City's Radio City Music Hall later this month.