Melville, NY - New York Islanders forward Mikhail Grabovski is out indefinitely.

Newsday reported that Grabovski passed concussion tests on Thursday night after absorbing a clean, hard, open-ice hit from San Jose's John Scott, but awoke on Friday with concussion-like symptoms.

Grabovski contributed two goals and one assist to the Isles' 4-0-0 start to the season, after the club inked him to a four-year contract at the outset of free agency in July.