Red Wings goalie Jimmy Howard will miss four to six weeks due to a knee sprain, general manager Ken Holland told reporters Friday.

Howard was hurt Tuesday night in a 4-1 loss at Tampa Bay. He left the game in the second period, unable to put weight on his right leg.

The Blackhawks will welcome goalie Corey Crawford back to the lineup on Friday, but they won't have center Artem Anisimov or winger Marian Hossa.

Anisimov, who has 14 goals and 13 assists playing mostly on the line with Patrick Kane and Artemi Panarin, was placed on injured reserve Thursday, retroactive to Dec. 18. He suffered an upper-body injury during Saturday night's victory at St. Louis.

Crawford is returning from having an emergency appendectomy in Philadelphia on Dec. 3. Blackhawks coach Joel Quenneville said Thursday that Crawford will be between the pipes on Friday.

Lightning goalie Ben Bishop will miss three to four weeks with a lower-body injury, the team announced Wednesday.

In a corresponding roster move, the Lightning recalled goalie Kristers Gudlevskis from their Syracuse AHL team.

Penguins defenseman Kris Letang will miss a couple of weeks due to a lower-body injury.

Coach Mike Sullivan announced the injury on Thursday, less than 24 hours after Letang played 26 minutes in a 4-3 overtime win over the Bruins. 

Hockey Hall of Famer Eric Lindros says Canada needs a national standard to diagnose and treat concussions in sports.

He joined former pro hockey and football players at a conference Tuesday to discuss a protocol that could be taught in schools to help young athletes recognize a head injury.