Rooney tweeted to fans this morning about the news after he was spotted going into a Harley Street clinic.
The United star revealed: "Just to confirm to all my followers I have had a hair transplant. I was going bald at 25 why not. I'm delighted with the result.
"It's still a bit bruised and swollen when it dies down u will be first to see it. Anyone recommend any good hair gel. Haha.
"I had it done in Harley street hair clinic London. Thanks to all the staff who looked after me."