Yorkshire have set overseas signing Rana Naved-ul-Hasan a deadline of the end of the month to prove his fitness.
The Pakistan seamer dislocated his shoulder when he crashed into an advertising hoarding fielding in a match for county champions Sussex last season.
The 29-year-old was later signed by Yorkshire for 2008 but the club are now concerned about his recovery.
A statement on the club's website confirmed the player will undergo a final assessment with their physio on January 31.
"The club has been determined to give Rana time to prove his rehabilitation from the shoulder injury sustained when playing for Sussex at the end of last season.
"If he has not recovered sufficiently to play for Yorkshire this summer a contingency plan is in existence."