Charles Dunne is expected to be out for a minimum of three months with a groin injury.
The defender suffered the injury when making a clearance during our Betfred Cup match at Stranraer last Saturday.
Following scans earlier this week, Dunne will likely require an operation, ruling him out for a significant period of time.
“It’s a blow to lose Charles,” manager Stephen Robinson said of the news. “He is a key part of our defence and showed last season how important he is to the team.
“We wish him a quick and full recovery. The onus now is on the other defenders in the squad to step up and nail down a first team place.”