The 
Bruins placed James Hagens on injured reserve on Saturday, a concrete update for poolers tracking Boston's young center.
What happened
Belle Fraser (Bruins multimedia) confirmed Hagens is on IR with an injury date of Nov. 5, and that Mikey Eyssimont has been recalled from Providence. NESN and TSN relayed the confirmation.
Hagens hurt his back on a cross-check in the win over Pittsburgh. Joe Haggerty and other local reporters note he did not finish that game.
Return window
IR rules require a minimum of 7 days from the injury date. That makes Hagens eligible to return as early as Nov. 12. Local sources say he could miss only a few games if the injury stays minor, but exact severity is still unknown.
Eyssimont recalled
Mikey Eyssimont arrives from Providence after a strong AHL stretch. In formats that allow moves, he is a short-term volume name to watch while Hagens is out.
Pool take
Hagens was off to a solid rookie start (around 12 points in 17 games per reports). An IR stint slows that pace, but the 7-day floor leaves room for a quick return. Be patient if your format allows it, and keep an eye on our rumors.