The Canadiens loaned Gignac to AHL Laval on Monday.
Gignac was summoned by the Canadiens on Saturday.
Gignac was waived Sunday, Elliotte Friedman of Sportsnet reports.
Gignac was put on waivers Thursday, per Renaud Lavoie of TVA Sports.
Gignac scored a goal on two shots over 10:50 of ice time in Tuesday's 5-0 win over the Ducks.
Gignac had two blocks over 14:54 of ice time in Tuesday's 5-2 win over the Capitals.
Gignac signed a two-year, two-way contract with Montreal on Sunday.
Gignac was reassigned to AHL Laval on Tuesday.
Gignac did not receive a qualifying offer from the Devils on Monday and will become a free agent.
Gignac was waived by the Devils on Monday, Corey Masisak of The Athletic reports.