Luff (upper body) was placed on waivers Sunday, Elliotte Friedman of Sportsnet reports.
Luff (upper body) suffered a long-term injury during Sunday's scrimmage, according to Max Bultman of The Athletic.
Luff suffered an upper-body injury Sunday during an intrasquad scrimmage, Helene St. James of the Detroit Free Press reports.
Luff signed a one-year, two-way contract with Detroit on Saturday.
Luff wasn't given a qualifying offer by Detroit, which means he will become an unrestricted free agent Saturday, per Max Bultman of The Athletic.
Luff was recalled from AHL Grand Rapids on Monday.
Luff was sent back to AHL Grand Rapids on Sunday, per CapFriendly.
Luff was brought up from AHL Grand Rapids on Tuesday.
Luff was demoted to AHL Grand Rapids on Wednesday.
Luff was recalled from AHL Grand Rapids on Monday.