Ottawa Senators forward Clarke MacArthur sustained a concussion at practice Sunday.
"We wanted to be up front about this," Senators general manager Pierre Dorion said. "Clarke is a big part of our team. The most important thing here is caring about the human being. Clarke has suffered a concussion. We don't know much, this has just happened an hour ago. He spent time with our doctors and medical staff. We sent him home. He's going to be re-evaluated tomorrow. Obviously with concussions there are symptoms, it's very complicated, so I can't give you too many answers today. We just felt because Clarke is such a good guy, such a big part of our team that I should speak and try to update you as much as we can."
MacArthur, 31, who has 91 points in 145 games with the Senators, left practice early after he was hit from behind by teammate Patrick Sieloff.
"Players are trying to make a name," Senators coach Guy Boucher said. "I think players are just playing the game. Whether it's a practice, whether it's a game, hockey players, they want to do well. Whether it's skating, hitting, I don't think we've had anybody out there, going out there premeditating elbows and slashing. We haven't had any of that during practices or the games, so I don't think there's anything different today that happened in a normal game."
MacArthur missed the Senators' final 78 games of 2015-16 after sustaining a concussion Oct. 14 against the Columbus Blue Jackets.
"Obviously [Clarke's] a good player on our team, a great leader, and we know the history," Boucher said. "It's not something that we want repeated. But I think right now we've got to be looking at, it's today and he's resting and we'll see tomorrow where that's at. I'd hate to look at things on a dark side before we know exactly where that's taking us."
MacArthur's injury comes one day after Senators forward Mark Stone, 24, was diagnosed with a concussion on Saturday. Stone, whose 61 points last season was second on the Senators, was injured at practice Friday.