The Red Devils have arrived in Bangkok for their pre-season summer tour and Moyes is upbeat regarding Rooney's future at Old Trafford.
The 27-year-old made his Everton debut as a teenager under Moyes and the two were recently re-united when the Scot replaced Sir Alex Ferguson as manager.
Moyes said of Rooney: "The team here are telling me it is the best shape they have seen him in for five years.
"And I am taking that as a positive. The club have already stated Wayne is staying and is not for sale.
"I am going to get the best Wayne Rooney I possibly can."
United, who were greeted in Thailand by hundreds of fans, are playing five matches in the Far East and Australia with Saturday's opener against Singha All Stars being a sell-out.