“The initial indications are that the procedure was successful,” United said in a statement. “Cristiano will begin his convalescence under the direction of club medical staff and an estimation of his return to full fitness will be possible following review by the specialist in one month.”
That will be about a week before United open their season against Newcastle in mid-August – a match the club expect him to miss.
Ronaldo was assessed last week by doctors from the Portuguese Football Federation and United – his first face-to-face contact with club officials since openly stating his desire to join Real Madrid.
Surgeon Niek van Dijk carried out yesterday’s operation at the Academic Medical Centre with Ronaldo expected to leave the hospital the same day.
The 23-year-old Ronaldo revealed after last month’s European Championship that he had been playing in pain for the last three months.
Ronaldo scored 42 goals for the Red Devils last season as he led them to the Premier League and Champions League titles. But at Euro 2008, Portugal lost in the quarter-finals.