The Pole was stretchered off in the second-half of Stockport's 1-1 draw at Southend on Saturday.
It was Fojut's debut for County, having arrived from Bolton on a month's loan last week.
County boss Jim Gannon said: "Jaroslaw appears to have had a problem between his back and his hamstring. So it's possible that it's not a muscle problem and could be a nerve problem.
"If that is the case, it could settle down quite quickly and he will return to County."
There was better news for Tommy Rowe, who went off at half-time at Southend after injuring his arm.
Rowe trained on Monday and will be available for Saturday's home game against struuggling Colchester United, 11 places below County in the League One table.
Tweet

Comments
Login or Register to comment
There are no comments about this at the moment.