Los Angeles ( CNN ) -- Elton John checked into a Los Angeles hospital Wednesday , where doctors diagnosed the 65-year-old singer with a serious respiratory infection , his publicist said Thursday . John was released from Cedars-Sinai Medical Center in Los Angeles after testing and treatment Wednesday , according to his publicist . John became ill while performing his `` Million Dollar Piano '' show at The Colosseum at Caesars Palace in Las Vegas last weekend , leading him to undergo testing at Cedars-Sinai on Wednesday . `` Those tests resulted in the attending Cedars-Sinai physician recommending that Elton not perform any concerts for approximately seven days with complete rest and antibiotic treatment to cure his respiratory infection and prevent any damage , '' a statement from the publicist said . His shows Thursday , Saturday and Sunday at The Colosseum have been canceled , the statement said . `` It feels strange not to be able to perform these 'Million Dollar Piano ' concerts at The Colosseum , '' John said in the statement . `` I love performing this show and I will be thrilled when we return to The Colosseum in October to complete the 11 concerts soon to be scheduled . All I can say to the fans is sorry I ca n't be with you . '' CNN 's Jane Caffrey contributed to this report .
NEW : John is released from Caesars Palace after testing and treatment . Elton John , seven days , became ill while performing at Caesars Palace in Las Vegas last weekend . Doctors order seven days of complete rest and antibiotic treatment . His 11 shows at the Caesars Colosseum are canceled .