Nash, acquired in a blockbuster trade over the summer, was questionable before Sunday's game with an undisclosed injury/illness but ended up taking warm-ups and played 22:33 against the Washington Capitals.
Asked in his pregame news conference Tuesday if the team could provide an update on Nash, coach John Tortorella said:
"No. He's out."
Asked earlier in the week what was ailing the team's star player, Tortorella was similarly curt.
"None of your business," he said.
Tortorella later went on to say that he would not discuss injuries this season, but that Nash was "banged up."
Nash sustained a nasty hit from Boston's Milan Lucic last Tuesday in the team's 4-3 shootout win over the Bruins. Nash's head smashed against the glass after Lucic drove him into the boards, although there was no penalty on the play and Nash remained in the game.
A source indicated to ESPNNewYork.com that neither Nash nor the club was happy with the Lucic hit on Nash and felt the Bruins' physical forward should've been penalized on the play.
Nash showed no outward ill effects, however, and played against the Islanders last Thursday at Madison Square Garden.
Nash then missed a season ticket-holder event on Friday due to "illness" and did not practice on Saturday, for what the team characterized as a "maintenance day."
He was then questionable for Sunday's game, causing there to be rampant speculation that Nash's injury or illness might be related to the Lucic hit.
The 28-year-old Nash, acquired in a trade with Columbus in the off-season, played all 82 games with the Blue Jackets last season.