Thirlwell sat out all of November and although he returned at the start of December, the midfielder limped out of the Boxing Day win over Hartlepool and has been sidelined since.
Fellow midfielder James Berrett recently returned from a groin injury and played the full 90 minutes in the New Year's Day defeat at Crewe despite struggling with a virus.
Forward Paddy Madden made his loan move to Yeovil a permanent one this week and fellow striker Danny Cadamarteri remains doubtful with the calf injury that has kept him out of the last three matches.
Rory Loy is pushing for his first start since recently returning from a broken leg and manager Greg Abbott could be tempted to make changes to his back four, with Peter Murphy pushing for a recall.
- Sports & Recreation
- Paddy Madden
- James Berrett