BUFFALO, N.Y. — Buffalo Sabres coach Lindy Ruff is absent from practice a day after breaking three ribs during an on-ice collision in practice with defenseman Jordan Leopold.

General manager Darcy Regier is scheduled to update Ruff's status later in the day. The Sabres had initially announced Monday that Ruff was expected to resume his coaching duties Tuesday.

That didn't happen as assistant coach James Patrick ran practice. It's unclear whether Ruff will behind the bench for Buffalo's home game against Boston on Wednesday.

Ruff was hurt late in practice on Monday, when Leopold lost his footing and slid, head-first into the back of the coach's skates. Ruff was looking the other way, and fell backward before landing on the ice on his right side with a heavy thud.