The 19-year-old will not take part in any NHL or AHL games for roughly four weeks as he deals with mononucleosis (otherwise known as mono), the team announced on Friday.
Meier was drafted with the ninth overall pick in 2015 and split last season between the Halifax Mooseheads and the Rouyn-Noranda Huskies of the QMJHL where he had a combined 34 goals and 87 points in 52 games.
It seems like the World Cup began just yesterday, but it's over just like that.
Canada are champions - that's no surprise. That it took tight 3-1 and 2-1 wins over a competitive European squad to get it done is.
Here's what we learned over the past few weeks.
September hockey can be glorious
Pick one: the World Cup of Hockey or preseason hockey.
For all the tournament's criticism, hockey of the absolute highest quality was played for three weeks in September. Canada and the U.S. played each other three times, and you'd be hard-pressed to find anyone who could point out which two didn't matter.
An Under-23 squad of the finest North American players on this planet, arguably the fastest team ever - ever! - assembled, played six games, winning four of them.
Three-on-three overtime is a new phenomenon, but North America and Sweden gave us the best five minutes of the format we've ever seen.
Hockey is fun. Especially in September, after two months without it, featuring the sport's finest players. You should have enjoyed it.
The most super-pest to ever super pest, Marchand is the classic "Hate him unless he's on my team" player. The type who Bruins fans would go to the ends of the earth to support - and rightfully so. That he's loathed by most outside Boston is, in the end, a sign that he does his job well.
There's no denying Marchand's talent. He's a five-time 20-goal scorer and would have hit the mark in 2012-13 if not for the lockout. He exploded for a career-high 37 goals and 61 points last season, and picked up where he left off this fall.
Marchand looked remarkably calm and comfortable playing alongside Sidney Crosby, and finished with a World Cup-best five goals - four of them in the semifinal and final.
They were big goals, too - none bigger than Thursday night's tournament winner.
The World Cup offered a glimpse into life as a Bruins supporter. Patrice Bergeron and Marchand are world-class players, and when No. 63 exchanges black and gold for red and white, the hatred is traded for admiration. When Marchand's not pissing you off, he's actually quite enjoyable to root for.
Respect, Mr. Marchand. But now back to our regularly scheduled programming.
The World Cup mattered
Think this tournament didn't matter? Europe captain Anze Kopitar would like a word:
With all due respect to Slovenia - Kopitar's homeland - it will never find itself in a tournament final against Canada, best-on-best or not. So the magnitude of Kopitar's experience wasn't lost on the 29-year-old, or his teammates, as they proved worthy final opponents.
"There has never been a team in a tournament like this with no past and no future," head coach Ralph Krueger famously said earlier in the week, and the Europeans forged an identity based on that ethos.
Canada's dominance over the past six years has gone all but unchallenged, which made it hard to root against the Europeans in their upset bid Thursday, with the game tied 1-1 and Drew Doughty in the penalty box. At the very least, we would have had one more game.
Europe fell short, but the squad leaves Toronto with its heads held high.
Ken Hitchcock is considering the possibility of coaching in the NHL beyond this season, but he's still leaning toward moving on next summer.
The St. Louis Blues head coach admitted there's a chance the coming campaign might not be his last in the league.
"That (coming back) is possible, but that's in May or June and that's a long time off and you know I just don't think at this time ... I don't think it's fair to do that," Hitchcock told TSN's Darren Dreger.
"I'm going to coach like crazy and I want to see how I feel and if I feel different then I will let somebody know. Other than that, I feel like I want to pour it all in now and then take stock at a different time."
In late May, the Blues announced Hitchcock was returning for "one final season."
When the Blues hired Mike Yeo as associate coach in mid-June, general manager Doug Armstrong said Yeo would serve under Hitchcock in 2016-17, then succeed him as head coach "for three years after that."
TSN's Bob McKenzie said on Toronto radio Friday that the club's plan hasn't changed, and that if Hitchcock decides to coach beyond this season, it won't be with St. Louis.
The veteran coach told Dreger that there could eventually be enough motivation for him to reverse his original plan, but he won't decide that any time soon.
“Maybe there will be, but that's a decision that's going to be made quite a few months from now,” Hitchcock said.
“Looking back, when we talked about this in May I couldn't make that decision and I didn't think it was fair to the team, nor to Doug (Armstrong) to sit there and hold them hostage, so we were proactive in it.”
The 64-year-old is entering his 20th season behind an NHL bench, and his sixth with the Blues.
He guided St. Louis to the Western Conference final in 2015-16, and ranks fourth all time with 757 coaching victories.
The Pittsburgh Penguins will get reacquainted with the commander in chief before their latest title defense begins.
President Obama will host the Stanley Cup champions Thursday at the White House, the NHL confirmed Friday. The Penguins visited the nation's capital for a similar ceremony after winning the Cup in 2009.
The president invited the team during a call with head coach Mike Sullivan to congratulate him in June.
Pittsburgh opens its 2016-17 regular-season schedule at home against the Washington Capitals on Oct. 13.
theScore is previewing each team leading up to the 2016-17 season.
Is this the year the perpetually rebuilding Edmonton Oilers finally rise to the ranks of the competitive?
A full season out of Connor McDavid will certainly give them a fighting chance, while a deep and talented forward corps, and a bona fide starting goalie may be enough to cover up apparent weaknesses that remain on the blue line.
Here's what the opening night roster may look like in Edmonton.
Kris Versteeg entered training camp on a professional tryout, and could have a good shot at landing an opening night roster spot as an experienced depth forward.
Eric Gryba returned to the Oilers on a PTO of his own heading into training camp.
As much as Adam Larsson's addition was meant to bolster the blue line, this remains Edmonton's greatest area of weakness.
Cam Talbot proved to be up to the task of stepping into a starter's role last season, but Jonas Gustavsson may not be solid enough insurance to afford him the rest he'll need if they hope for meaningful hockey late in the season.