London: World 100 metres record holder Usain Bolt will not run again this season because of a back injury, his agent said on Tuesday.
Bolt, beaten by American Tyson Gay in Stockholm last Friday, had been due to compete in the Diamond League meetings in Zurich and Brussels this month.
Triple Olympic champion Bolt was examined on Monday by a Munich doctor who found a problem with the Jamaican's lower back, which if not treated could cause injury to his hamstring or calf muscles.
"With a view to his future career we believe further treatment to loosen his back followed by a period of rest will be in his best interest," Bolt's agent Ricky Simms said in a statement.
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Bolt, 23, had been troubled by an Achilles tendon problem this season but an MRI scan showed that injury was now healed.