With the club announcing the surgery, they confirmed that the midfielder would miss the rest of the season.
Fernandez said: I wanted to let you know that my operation was successful everything went well thank God.
I needed to get this surgery since I been dragging the pain for about 6 months. It was something I could avoid while constantly treating myself with injections and medications.
But a few weeks ago the pain started to get more and more intense, without any of this taking effect, and it was worse as I trained and played annoyingly, but I didn't want to stop being in the games I had.
Whenever I got to play with Chelsea jersey, like the national team, I always try to do my best despite all this but I can't stand it anymore.
Thank you for the messages, encouragement and your token of love always. Shout out to everyone I promise you I'm coming back stronger than ever."