London, Mar 21: King of pop Michael Jackson has sparked fears for his comeback tour after he was spotted wearing a surgeon’s mask and cap.

The 50-year-old singer fuelled health concerns after he was seen behind a surgeon’s mask and cap as he came out of his doctor’s office in Los Angeles.

“I was over the moon when I got tickets but now I’m on a knife edge waiting to see if he’ll make it,” the Daily Star quoted Jacko’s fan Natasha Jones, 33, from north London as saying.

“Michael’s not doing himself any favours wandering around in a mask after claiming that he is back to his best.

“I''m a massive fan. But anyone can see he doesn’t look right and the shows are bound to take it out of him even more.

“I hope he can get himself strong enough to moonwalk for 50 shows on the trot,” she added.

According to a source from music industry, “There is a lot of speculation about whether Michael will be well enough to make all the shows. The promoters must have all their fingers crossed.”

Jackson will be performing 50 shows at the London’s O2 arena, continuing his ‘last ever’ gigs well into 2010. He has added new shows throughout the first two months of the year, ending February 24. (ANI)