The 28-year old scored his 211th and 212th United goals in the weekend's 2-0 win at West Ham United to become the third-highest scorer in the club's history.
Rooney surpassed Jack Rowley to now sit behind only Sir Bobby Charlton and Denis Law on the Red Devils scoring chart which automatically has him as a legend of the Old Trafford outfit according to Moyes.
"If you are third top scorer of a club like Manchester United you already are a legend," said Moyes.
"As long as he doesn't pick up any serious injuries he has a real good chance of breaking Denis Law's and Sir Bobby Charlton's records and that would be some feat.
"His form throughout the season has been very good and his goal against West Ham capped it all off. He showed what he is about and he has a big energy back again.
"Everyone who knew Wayne Rooney in his early days would say one of the biggest things about him was that he had big energy and a big heart and if you get Wayne playing like that then the rest of his football takes care of itself."
Rooney is now up to 152 Premier League goals from 301 appearances which has his overall total on 212 goals from 431 outings for United.
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