Gustavsson was hurt when he reached back for a rebound that Rangers center Derick Brassard put into the net on a 4-on-3 power play in overtime at Madison Square Garden.
"He’ll probably be out a bit," coach Mike Babcock said. "I don’t know exactly until our doctors see him."
Gustavsson, 30, had started three of Detroit’s 13 games this season. He is 1-1-1 with a 2.30 goals-against average and a .908 save percentage.
This is Gustavsson’s third season with the Red Wings after he signed as a free agent in July 2012. He played his first three seasons with the Toronto Maple Leafs after signing as a free agent from Sweden in 2009.
In 144 career games, Gustavsson is 58-53-21 with a 2.89 GAA and .901 save percentage.
Mrazek played in nine games for the Red Wings last season and had a 1.74 GAA and .927 save percentage while going 2-4-0. The 22-year-old was a fifth-round pick in 2010 and signed in 2012.
- Phil Watson