Wild forward Jason Pominville also missed Thursday's practice and will not travel to Chicago for Friday's game. He missed Game 1.
Coach Mike Yeo says if Backstrom is unable to go, Josh Harding will get the start on Friday night after he made 35 saves in Minnesota's 2-1 overtime loss in the opener Tuesday night.
Blackhawks centre Dave Bolland and goalie Ray Emery have been ruled out for Game 2 due to lower-body injuries. But Emery skated on Thursday, and coach Joel Quenneville says both players could travel to Minnesota for Game 3 on Sunday.
I don't think today was my most solid game that I've had, some rebounds here and there. I know there's a lot of work to do, not every game is going to go as good as these last few. I've just got to make sure I keep working and keep trying to get better.
— Los Angeles Kings goaltender Martin Jones after stopping 38 of 39 shots in a 3-1 win over the Toronto Maple Leafs