Rihanna has postponed the start of her 'Anti' world tour which was due to kick off next weekend, just days after pulling out of the Grammys 2016 with bronchitis.
The announcement comes just a day after the singer revealed she was delaying the start of her world tour due to an illness affecting her voice.
Fans have been told Rihanna's shows in Cardiff on 16 June and Sunderland on 18 June have both been cancelled.
Sunderland AFC's commercial director Gary Hutchinson said: "Unfortunately this is something that can happen with major tours and naturally we are sorry for those concert-goers who were looking forward to the show.
"We still have an exciting summer of events planned at the Stadium of Light however, including the sell-out Beyonce concert, which everyone is looking forward to."
Refunds or swaps to other shows are being offered to customers.
The first scheduled show on the tour is now 12 March in Jacksonville, Florida, according to Rihanna's website and notices from venues.
Rihanna had previously been due to open the tour on 26 February in San Diego, but has postponed eight shows.
The singer abruptly cancelled a performance on Monday at the Grammys, the music industry's top awards.
Her representative said at the time that the Barbados-born singer had fallen ill and was under doctor's orders to rest her vocal cords to avoid permanent damage.
Rihanna is scheduled to end the tour on 12 August in Zurich.
Anti is her first full-length album since 2012.