MONTREAL -- Shea Theodore will miss the rest of the 4 Nations Face-Off because of an upper-body injury he sustained in Canada’s 4-3 overtime win against Sweden at Bell Centre on Wednesday. The defenseman left the best-on-best tournament opener shortly after he was checked into the boards by Sweden forward Adrian Kempe at 2:23 of the second period.

Canada defenseman Shea Theodore is out for the rest of the 4 Nations Face-Off because of injury, coach Jon Cooper said after his team beat Sweden 4-3 in overtime in the first game of the NHL-run tournament,

Canada defenseman Shea Theodore is out for the rest of the 4 Nations Face-Off because of an injury suffered during Wednesday night's tournament opener against Sweden.

The NHL season is on hiatus this week as the 4 Nations Face-Off gets underway in Montreal, but what is the tournament, and who is playing?

Here’s everything you need to know about the tournament. Who’s participating? The titular four nations are the United States, Canada, Sweden and Finland. Other notable hockey