"I am ready for Erin Hills and looking forward to playing there for the first time," McIlroy told The Guardian newspaper.
"The last few weeks have obviously been frustrating... but it was important I got back to a level of fitness where I felt like I could give myself the best possible chance at the U.S. Open.
"As I have said many times before, majors will ultimately determine my golf career but I have had the rest of this busy season to consider as well."
McIlroy sustained the injury earlier this year and suffered a recurrence during the Players Championship, where he finished tied for 35th. He subsequently withdrew from the European Tour's PGA Championship and the Memorial tournament on the PGA Tour.
The Northern Irishman won the 2011 U.S. Open at Bethesda, Maryland by eight strokes and will be seeking his second title in the event.
(Reporting by Aditi Prakash in Bengaluru; Editing by John O'Brien)
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