Regula (knee) was placed on the injured non-roster list Monday, Mark Divver of the New England Hockey Journal reports.
Regula (knee) won't play in Boston's preseason finale against Washington on Saturday.
Regula (lower body) is expected to miss the beginning of training camp, per Mark Divver of the New England Hockey Journal on Tuesday.
Regula signed a one-year, two-way contract with Boston on Friday.
Regula was put on waivers Tuesday, Chris Johnston of TSN reports.
Regula inked a one-year, two-way contract with Boston on Monday.
Boston acquired Regula and Ian Mitchell from Chicago on Monday in exchange for forwards Taylor Hall and Nick Foligno.
Regula was demoted to AHL Rockford on Thursday, Charlie Roumeliotis of NBC Sports Chicago reports.
Regula was recalled by the Blackhawks on Tuesday, Charlie Roumeliotis of NBC Sports Chicago reports.
Regula was reassigned to AHL Rockford after Wednesday's game versus the Golden Knights, Scott Powers of The Athletic reports.