Niku signed a contract with JYP Jyvaskyla of the Finnish Elite League, Scott Billeck of the Winnipeg Sun reports.
Niku cleared waivers and joined the taxi squad Thursday.
The Canadiens placed Niku on waivers Wednesday.
Niku recorded two assists in Saturday's 5-2 loss to the Panthers.
Niku (not injury related) will suit up against the Lightning on Tuesday, per the NHL's media site.
Niku (not injury related) was removed from the NHL's COVID-19 protocols Monday but isn't expected to play before Saturday's clash with the Bruins, Arpon Basu of The Athletic reports.
Niku entered the NHL's COVID-19 protocols Thursday.
Niku had an assist, one hit and one blocked shot in Saturday's 6-3 win over Pittsburgh.
Niku was a healthy scratch for Sunday's game against the Ducks.
Niku had two assists, one shot on goal, one hit and one blocked shot over 15:32 of ice time in Saturday's 6-1 win over Detroit.