Hillis was released from his professional tryout offer with Detroit on Sunday, per CBS.
Hillis signed a professional tryout agreement with Detroit on Monday, per CapFriendly.
Chicago obtained Hillis in a trade with Montreal on Wednesday in exchange for defenseman Nicolas Beaudin.
The Canadiens removed Hillis from COVID-19 protocols and reassigned him to AHL Laval on Wednesday.
Hillis was placed in the NHL's COVID-19 protocols Wednesday.
Hillis has been promoted to Montreal's active roster and will make his NHL debut Saturday versus Florida.
Hillis is expected to be active for Saturday's game against Florida, Pat Hickey of the Montreal Gazette reports.
The Canadiens added Hillis to their taxi squad Monday.
Hillis was reassigned to AHL Laval on Sunday, CapFriendly reports.
Hillis was promoted to the taxi squad Saturday, per CapFriendly.