He suffered a torn hamstring during a scrimmage earlier this week:
— NHL News (@PuckReportNHL) January 6, 2021
The Sabres have announced the following update regarding forward Zemgus Girgensons. pic.twitter.com/7RrS6bKDse
— Sabres PR (@SabresPR) January 6, 2021
It seems likely that Girgensons will miss the entire season with a recovery time of about six months. The organization will want him to fully recover and may be best for them to just heal up until October.
Losing Girgensons means the Sabres take a hit defensively and on the penalty kill. Girgensons was very useful in those two departments, but now this opens up an opportunity for someone else to step in.