Real Madrid confirmed the operation on Monday in an official statement.
"Our player Ferland Mendy underwent successful surgery today, under the supervision of the Real Madrid Medical Services, for an injury to the rectus femoris muscle of his right leg. Mendy will begin his recovery work in the coming days."
The surgery was carried out by Dr Bertrand Sonnery-Cottet, the Lyon-based specialist who has treated a number of high-profile French internationals including Kylian Mbappé — for a knee problem earlier this season — and former Madrid and Lyon striker Karim Benzema. Real Madrid medical personnel were present throughout the procedure.
Mendy suffered the injury on May 3 during Real Madrid's La Liga victory at RCD Espanyol, leaving the pitch just ten minutes into only his ninth appearance of the season. Scans confirmed a complete tendon detachment — an injury that raised fears of a year-long absence or even retirement, though the confirmed timeline is now more optimistic.
The 30-year-old Frenchman has managed just 448 minutes of football this season across nine appearances, suffering five separate injuries across the campaign. His contract runs until June 2028. Real Madrid are understood to be committed to honouring it, valuing the loyalty Mendy has shown in playing through discomfort on a number of occasions.
Despite the latest setback, interim head coach Álvaro Arbeloa had been prepared to use him when available. Mendy started the Champions League quarter-final first leg against Manchester City and the semi-final second leg against Bayern Munich — two of the biggest matches of the season — despite having barely featured beforehand.
He joined Real Madrid from Olympique Lyon in 2019 for around £48million and has won two La Liga titles and a Champions League during his time at the Bernabéu. Any possibility of a summer sale has been effectively ended by the injury, which means his future with the club will now be reassessed once he completes his rehabilitation.