Although Moyes helped the forward sign his £85 million, five-year deal, it did not dissuade Rooney from sliding in on his manager in training on Tuesday.
"This playing against United lark really is too easy."
But in a rare moment of composed class during his turbulent time at United, Moyes evaded the challenge, much to his delight.
United are preparing for their Champions League round-of-16 second leg against Olympiakos tomorrow night.
Moyes's side trail the Greek champions by two goals as they attempt to salvage some pride from a catastrophic campaign.
United were ejected from both domestic cups in January and are 18 points adrift of Premier League leaders Chelsea.