Jones was forced off after just 20 minutes of Good Friday's 2-2 draw at Carlisle with a suspected dislocated shoulder, which is likely to rule him out for the remainder of the season.
The news is a particular blow to boss Graham Turner with fellow defenders Cameron Gayle (hamstring) and Rob Edwards (thigh) already struggling to play again this term, while Jermaine Grandison (hip) is also lacking match fitness after a lengthy spell on the sidelines.
Connor Goldson replaced Jones at Brunton Park and is likely to do so from the off for the visit of Crawley.
Midfielder Dave McAllister was rested to the bench on Friday and will hope to return, while loan signing Akwasi Asante is also pushing for greater involvement having made his debut as a 73rd-minute substitute.
- Sports & Recreation
- Jermaine Grandison
- Graham Turner