They didn't need another one added to that list.
When Patrice Bergeron left during his first shift of the second period after going hard into the end boards, the Bruins' bench no doubt took a collective breath.
It came as a result of Niklas Kronwall finishing his check on Bergeron. The alternate captain skated off the ice and went right down the tunnel just 35 seconds into the period.
But, he eventually returned in the second period, and he was fine. He finished the game. He spoke with reporters afterwards.
"No, I didn’t feel that [I was in trouble]," Bergeron said postgame, from the visiting team locker room at Joe Louis Arena. "It’s one of those protocols that you have to respect, and I had to go to the quiet room, and it takes forever to go through that test, so it took a little bit of time but I was fine the whole time."
So, he wasn't worried?
"No, I wasn’t. No. Not at all," stated Bergeron.
Bergeron may not have been worried, but others were.
"Anytime a player comes off and he’s one of your top guys, there’s concern," said Head Coach Claude Julien. "It’s not because how thin we are in the middle, but anytime that happens."
"I was glad to see him come back and as far as he was concerned, he respected the protocol, he felt OK, he went in - because that’s what we should do and that’s the right thing to do, and he came back. So it was done properly and again, it’s respecting the protocol of the League for all the right reasons."
With Bergeron's concussion history, he and the Bruins felt it was the right call to make, though he felt fine right after the hit.
"He went to the quiet room, he felt great before he got there, but he did what he had to do," said Julien. "He said he was OK. He said, 'I’m going to do what I have to do here for the right reasons.'"
"He came back, so we were obviously very relieved, but definitely worried when he went out," said Brad Marchand.
Boston went on to fall 2-1 to the Wings in their home opener. When Bergeron returned to the game at 13:13 into the second, he took a slashing penalty 14 seconds into the shift. The Bruins had scrambled without Bergeron on the penalty kill for the first half of the second, and they again had to kill a penalty without him.
Detroit's Gustav Nyquist scored a minute into the ensuing power play.
Many would argue that Bergeron in the box is better than Bergeron in the quiet room, though.
The Bruins would have been in better shape during that middle frame with Bergeron's presence on the ice, as opposed to the time he spent being evaluated, getting asked questions, and testing his memory.
He was the only Bruin to find the back of the net behind Jimmy Howard, on the Bruins' first shot of the game at 7:59 into the first period.
"We didn’t have a great game tonight, so overall, whether he was there or not, I don’t know if it would’ve changed, but I know it kind of made it a little bit worse losing him," said Julien.
"I got thin down the middle and when we ended up with some penalties and he’s not around at that point, there’s no Campbell, there’s no Krejci, there's no Bergeron, and whenever those guys are in the penalty box - we got really thin. So I really had to work my bench the best I could, so it was a challenge."
"I think it’s just, 'next man up,'" said center Craig Cunningham, who - along with Carl Soderberg and Ryan Spooner - took shifts with Marchand and Reilly Smith when Bergeron was in the quiet room.
The Black and Gold weren't using Bergeron's second period absence as an excuse.
They struggled to find their legs - and their offensive touch - in the second game of an early season back-to-back. They didn't play their system, turned the puck over too often and iced it too many times, especially in the first period. Instead of initiating, they reacted.
They only mustered 17 shots on goal through 60 minutes. Eight of those came in the third period, when they finally made a resilient push.
"It definitely was a sloppy start and even in the second, we got caught back on our heels also," said Bergeron. "It wasn’t a good effort. It wasn’t our best."
"We couldn’t really get anything going offensively and even in the neutral zone, so we definitely have got to do a better job. We know they’re a good skating team and they took advantage of that, by us not executing."
"It’s a whole team thing," added Julien. "It's like - I think I can say that about a lot of players, a lot of individuals. So it’s one of those that you have to chalk up as not a very good team game and probably move forward here and see if we can’t bounce back on Saturday [against the Capitals]."
"I don’t think there’s anybody here that can say - besides maybe a couple of guys - that they played well."
Tuukka Rask may have been one of those guys in mind.
Suiting up in the back-to-back situation, the only two Detroit goals he let in came with plenty of traffic in front - he didn't have much of a chance. He was under siege at times during the second period. He was so zeroed in on stopping the puck, that he didn't even notice Bergeron left.
"Did he? I didn’t know that, so that's how focused I was, I guess," said Rask. "But it never helps to lose him."
Luckily, the Bruins don't have to worry about that.