The Club can confirm that Ryan Fredericks will have surgery on his ankle on Monday 1st August.
The full-back picked up the injury in our 3-0 pre-season victory over Brighton & Hove Albion, and had to be substituted early on.
A 10-12 week recovery period is anticipated post-surgery.
Goalkeepers Marcus Bettinelli and David Button will also miss the meeting with Crystal Palace with minor quad tightness and a minor ankle injury, respectively, while Tim Ream is out with illness and Cauley Woodrow has a minor ankle issue.
All four are expected to be available for our season opener against Newcastle United on Friday.