Sabres coach Lindy Ruff said Friday the team has not yet determined the seriousness of the injury, but noted that Drury was experiencing concussionlike symptoms.
Drury required more than 20 stitches to close a forehead gash. He landed headfirst after being hit by Neil 5:07 into the second period of Buffalo's 6-5 shootout victory Thursday night. Neil was not penalized and said after the game the hit was clean and Drury should have had his head up.
"It was a predator-type of hit where Chris was vulnerable," Ruff said. "Neil went out of his way to deliver a blow to Chris' head.
"It was a deliberate attempt to put somebody out."
Drury, who scored his team-leading 33rd goal during the game, becomes the eighth Sabres regular to be out with an injury. It's a list that includes forward Maxim Afinogenov (broken wrist), defenceman Jaroslav Spacek (broken hand) and centre Tim Connolly, who's missed the entire season with a concussion.
Buffalo has had at least one player injured in each of its last six games.
The Northeast Division rivals meet again Saturday night in Ottawa, the last game in their eight-game season series.
Neil turned into Drury just after the Sabres player snapped a shot from the right circle. Neil's shoulder struck the right side of Drury's head, knocking his helmet off and sending him flying.
When the puck hit the ice on the ensuing faceoff, Buffalo's Adam Mair crosschecked then punched Jason Spezza, while Andrew Peters grabbed Ottawa's Dany Heatley across the face from behind. All 12 players on the ice became involved. In the end, 100 penalty minutes were handed out - 63 against Buffalo - and three players ejected.
The Sabres have called up Mark Mancari from their AHL farm team in Rochester, N.Y. The six-foot-four, 225-pouind forward is expected to make his NHL debut Saturday. Mancari, born in London, Ont., has scored 16 goals and assisted on 18, with 34 penalty minutes, in 41 games with the Amerks this season.