Slaggert signed a two-year, $1.8 million contract extension with the Blackhawks on Friday.
Slaggert was assigned to AHL Rockford on Sunday, Charlie Roumeliotis of NBC Sports Chicago reports.
Slaggert was reassigned to AHL Rockford on Sunday, Ben Pope of the Chicago Sun-Times reports.
Slaggert posted an assist in Thursday's 5-4 overtime loss to the Kings.
Slaggert will make his NHL debut Friday at home against the Kings, per Charlie Roumeliotis of NBC Sports Chicago.
Slaggert signed a two-year, entry-level contract with Chicago on Sunday.