Shanahan skated towards the bench as Knuble came the other way. Neither player saw the other and they slammed shoulder-to-shoulder. Shanahan went flying backward and struck his head against the ice when he fell 7:27 into the third period of the Rangers' 5-3 loss.
X-rays and a CT scan were taken on Shanahan at St. Vincent's Hospital. All the tests were negative, but Shanahan was to be kept overnight for observation. The Rangers said he was awake, alert and moving all his extremities.
"It's always hard to see any of your players go down whether it's coincidental or otherwise," Rangers coach Tom Renney said. "It's tough, but we're going to have to overcome that and play in the spirit of what he's all about anyway.
"Hopefully, he won't be out too long."
The right side of Knuble's face was swollen, and the Flyers expressed concern he has broken bones around his eye. X-rays of his neck were negative and Knuble was allowed to accompany the team on the train back to Philadelphia. He was scheduled to be evaluated by a club physician Saturday night and then go for a CT scan on Sunday.
"There is a chance he may have broken something around there," Flyers general manager Paul Holmgren said. "He seemed OK. He was a little woozy."
Knuble declined to comment as he left Madison Square Garden.
Shanahan moved his left leg slightly as medical personnel attended to him, but his eyes remained close. Shanahan, 38, appeared to also be bleeding from the mouth one day after extensive dental work. He lost a tooth Thursday night at Carolina after being struck in the mouth by a puck.
Shanahan blinked his eyes and was talking to trainer Jim Ramsay as the stretcher rolled across the ice to the Zamboni entrance, chants of "Shanny, Shanny," trailing him during the ride.
The hit came moments after New York closed its deficit to 4-2 on a play in which Rangers captain Jaromir Jagr was rattled by a late hip check against the end boards by Flyers defenceman Derian Hatcher.
Several Rangers were injured during the game that was physical from the start.
Goalie Henrik Lundqvist left following the second period after a hard shot struck him in the left shoulder and sent him to the ice writhing in pain, and defenceman Marik Malik also was knocked out of the game and left favouring a shoulder after absorbing a check from Flyers forward Simon Gagne.
Lundqvist and Renney said it was the coach's decision not to send the goalie back out for the third period, more to give him rest than because of the injury. Lundqvist was hurting, but planned to be back in the nets Sunday afternoon when the Rangers face the Chicago Blackhawks.
"I could've kept playing for sure but they told me they wanted to make a change," Lundqvist said.