Brentford midfielder Jonathan Douglas underwent surgery on Wednesday to correct an issue with his right knee which had been troubling him during the closing weeks of the season.
The 31-year-old played the back end of last season in the knowledge that an operation was needed to cure an injury that had meant his opportunities to train between matches were restricted.
He ended the season with only Clayton Donaldson, Harlee Dean and Tony Craig having played more First Team games.
The Club's Head of Medical, Neil Greig, said: "Jonathan underwent an arthroscopic procedure yesterday in London under the care of a world renowned consultant knee surgeon.
"The procedure was to correct an ongoing condition that had developed over a long period of time and had been restricting his training and matches towards the end of the season.
"The surgery was delayed following the end of the season in order to allow the knee sufficient time to settle down from the demands of the season.
"This will hopefully make the recovery process a smoother journey for Jonathan.
"Following a period of rest and recovery Jonathan will begin a graduated rehabilitation programme.
"The timescales of this will be easier to estimate following the initial period of rest, as we see how the knee responds post-surgery."