Mich. Comp. Laws § 500.5108

Sec. 5108. Within 90 days after the effective date of the transfer, the acquiring insurer shall apply to the court or administrative agency in this state in which an action or proceeding is pending in which the state accident fund was a party pursuant to section 731 of the worker's disability compensation act of 1969, Act No. 317 of the Public Acts of 1969, being section 418.731 of the Michigan Compiled Laws, to be substituted as a party in place of the state accident fund.