Mich. Comp. Laws § 105.14: Juror; disability; procedure.

Sec. 14.

If any juror, after being sworn, and before the hearing shall have been commenced, shall die, or from sickness or any other cause be unable to discharge his duties as a juror, said probate court may cause to be drawn another person to serve in his place, who shall be sworn, and shall have the like qualifications, powers and duties as those already sworn.