And Sheridan will also be without long-term casualties Aaron Downes, Jamie Lowry and Gregor Robertson.
Robertson suffered a double fracture of his left leg a few weeks ago and is likely to be out for the rest of the campaign.
Lowry is also set to miss the rest of the season after having an operation on a cruciate ligament injury.
But the news regarding Aaron Downes is more positive. The 24-year-old has been out for seven months with a cruciate ligament injury but played 45 minutes for the reserves earlier in the week.