Susan Boyle is set to pull out of more shows on the Britain’s Got Talent tour, according to The Sun.

The 48-year-old, who was runner-up on the series, missed out on Friday’s show at the Cardiff International Arena, and the paper reports she will also be absent from the bill at Saturday’s gig in Nottingham.

Show bosses have been keeping a careful eye on Susan after she spent four days in London clinic The Priory suffering from exhaustion, following the Britain’s Got Talent final.

And a spokeswoman said she may not be back on stage at all this week – which would mean she may miss the tour’s date at London’s Wembley Arena .

“Susan would love to perform every night but is aware of what she can and can’t do,” the spokeswoman told the paper.

“I feel sorry for her because she doesn’t want to let people down, but she needs a rest.”

The singer has performed at several dates on the tour, but dropped out of Thursday’s show in Liverpool just hours before she was due on stage.

“Hopefully she can recharge her batteries and be back soon,” a source close to Susan said.