The England striker has flown back to Manchester from the clubs tour of the Far East with a hamstring injury but is also believed to be dismayed by manager David Moyes' plans.
Rooney has already handed in a transfer request this summer and a recent report on Sky suggests that perhaps he could be on his way out the Old Trafford exit doors sooner than later.
Reporter Kaveh Solhekol told Sky Sports News: "Rooney believes he is at the peak of his career and has no intention of becoming a squad rotation player or by playing second fiddle to anyone at Old Trafford.
"He believes he has nothing left to prove after nine successful seasons - yet that is what is being suggested by reports in the media which have interpreted the club's statement as meaning he's currently on trial for the coming season.
"Since he's returned from the pre-season tour due to injury, Rooney has been in touch with the club and spoken to David Moyes on the phone - he is angry and confused at the way he's been treated."