New York Islanders starting goaltender Jaroslav Halak may not be ready for the season opener next Friday, coach Jack Capuano told Newsday.

Halak, who has been sidelined with an upper-body injury, left practice early Thursday.

"We don't know yet," Capuano told the newspaper. "Until we go through a full practice and I can talk to the trainers and see what they have to say, we don't know what's going to happen."

The Islanders said Tuesday that Halak was day-to-day because of his injury. He has not played since the first two periods of the preseason opener against the Philadelphia Flyers on Sept. 21, and had not practiced again until Thursday.

Halak was 38-17-4 with a 2.43 goals-against average and .914 save percentage in an NHL career-high 59 games last season.

Backup Thomas Greiss and rookie Stephon Williams have handled the bulk of the goaltending since then. Greiss played all of the Islanders' 3-1 loss to the Washington Capitals on Monday.

The Islanders play their final preseason game at Washington on Sunday, then begin their regular season at their new home, Barclays Center, against the Chicago Blackhawks on Oct. 9.