The striker is ruled out for up to three weeks after being taken off against Bolton on Sunday.
Pain. not in Spain: Wayne Rooney leaves the hospital on Wednesday
Rooney will miss Manchester United's clashes with Valencia and Sunderland, as well as England's Euro 2012 qualifier with Montenegro on October 12.
While his United team-mates were away in Spain for Wednesday's Champions League showdown, Rooney visited the private Bridgewater Hospital in Manchester for a check-up.
Sidelined: Rooney walks away with his test results on the ankle scan
Wearing a hooded Stone Island jacket, he looked distincly unhappy to away from the action in Europe.
After emerging for his appointment, Rooney jumped back into his grey Bentley before heading back to United's Carrington HQ with the results.
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