Aaron Hickey is expected to miss most of the 2024/25 season due to a hamstring injury.
The Brentford defender suffered a setback during a training session last week and has undergone surgery.
Head physio Nick Stubbings said: “The procedure involved the removal of the previous repair sutures and making a new tendon repair.
“Now we aim to start afresh and help Aaron return to his previous level of health and performance.”