Rooney's absence immediately sparked fears the 27-year-old might miss England's vital World Cup qualifiers against Montenegro on October 11 and Poland four days later, upon which Roy Hodgson's hopes of reaching next summer's Finals in Brazil now hinge.
But Moyes is optimistic Rooney will be back for United's trip to Sunderland on Saturday.
"Wayne Rooney will be okay for Saturday," said Moyes. "He clashed shins with Danny Welbeck (in training).
"At a push we probably could have risked him but we decided not to."
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