David Rudisha’s coach said the Olympic 800m champion and world record-holder has pulled out of the world championships next month with a right knee injury.

Colm O’Connell told The Associated Press they waited as long as possible to see if Rudisha would recover after he missed six weeks of training and was treated in Germany for the problem.

O’Connell said Rudisha “has improved quite a lot but we didn’t want to do a crash course between now and the world championships, which may aggravate the injury.”

The coach said on Tuesday they “finally” made the decision that Rudisha would not defend his 800m world title in Moscow.

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