According to his website , the 66-year-old singer will have to undergo surgery in the next few weeks after a series of scans and blood tests revealed an abscess on his appendix.

The seemingly untiring star regularly performs more than 120 gigs every year, but a spokesman for Sir Elton said that he will remain sidelined until he’s fully recovered from his surgery and any damages caused by the appendicitis.

Over 65,000 were expecting to see the pop legend at the tour’s headline event at Hyde Park, part of the Barclaycard British Summer Time Festival.

Those already with tickets will be refunded. British Summer Time festival organisers AEG Live told BBC news the show would still go ahead with Elvis Costello and former Kinks frontman Ray Davies on the bill.

Sir Elton’s spokesman said that he “is incredibly disappointed to postpone these tour dates”. Other cancelled shows include a concert in Italy on Tuesday and Germany on Thursday.

 “To know that he made such super-human efforts and continued to perform to thousands through his illness only confirms his dedication to his European fans,” the spokesman added.

“He is eager to be back on top form and return to play the remaining shows starting in early September 2013.”

Sir Elton was confirmed only today as one of the stars due to play the iTunes Festival at London’s Roundhouse in September, alongside Arctic Monkeys and Justin Timberlake.

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