The veteran goalie was 21-18-5 last season with a .909 save percentage and 2.87 GAA with the Tampa Bay Lightning in 2009-10. Niittymaki is 83-79-28 with a 2.98 GAA and .903 save percentage in 210 career games.
The move comes on the heels of the Sharks' decision not to offer Evgeni Nabokov a new contract with the team. Nabokov won 293 regular-season games during his 10 seasons in San Jose, but shouldered much of the load for the team's postseason failures.
[He's] real confident with the puck now, getting it off his stick quick and no second-guessing. We need that. He's such a good guy in the room. He works so hard. That's the big thing. For not a big man, he just fights for every puck and when he scores, the guys appreciate that even more.
— Winnipeg Jets coach Paul Maurice on Mathieu Perreault, who scored two goals in win against Chicago Blackhawks on Tuesday