Zellweger (concussion) will miss Thursday's game in Columbus, per Mike Harrington of The Buffalo News.
Zellweger hasn't been ruled out for Saturday's tilt against Chicago, though. The 23-year-old defenseman had seven goals and 22 points in 76 regular-season outings with Anaheim in 2025-26. Zellweger might be part of Buffalo's third pairing once he's healthy.