Bay Mills Resort and Casino and five Kewadin Casinos closed voluntarily, since tribal casinos are not subject to state regulations.
Kewadin Casinos stated it "will continue to follow all health and sanitation guidelines in place, as well as the current phase chart which outlines restrictions based on positivity rates in each county."
Michigan Live reported the tribe had prepared additional funding to pay employees while the casino is closed.
Bay Mills Resort and Casino is expected to reopen on 8 December, while Kewadin Casinos should resume work on 9 December.
Michigan has 24 tribal casinos in total and the other 18 tribal casinos in the state will remain open with additional precautions, such as restaurant closures and event cancellations.
The Little River Casino announced adjusted work hours and guest capacity restricted to 25%.
The Hannahville Indian Community’s Island Resort and Casino said: "Guests and employees' health and safety are our top priority as we continue to remain diligent in our cleaning and safety protocols. At this time, we will be remaining open.”
However, events at the venue were cancelled until 10 December and restaurants continue to operate on a take-out basis.