Michael Jackson is "too thin" and should add weight before his mammoth O2 residency, according to medics.
Doctors say that the erstwhile King of Pop is 20lb underweight, and urgently needs to pile on the pounds before he ventures on to the 50 live shows, from July 8 to February 24.
The 50-year-old singer is also undergoing antibiotic treatment for a skin infection, still under pain from an old back injury and also wearing a mask to avoid picking up bugs.
While promoters AEG Live had claimed that Michael is "extremely fit" and looking forward to his shows, there are concerns that he may not be able to keep up with the gruelling dance routines.
"There are concerns Michael is too frail. He has been ordered to eat more but he refuses to and eats like a bird," the Sun quoted a source as saying.