Islanders goalie Rick DiPietro was diagnosed with a mild left knee sprain Saturday and is day-to-day.
New York Islanders center Doug Weight will be out six weeks because of a knee injury.
The Islanders were without No. 1 goalie Rick DiPietro and forward Trent Hunter when they faced the Senators.
The New York Islanders will be without backup goalie Garth Snow for up to four weeks after the 12-year NHL veteran sprained ligaments in both knees.
Florida Panthers center Stephen Weiss will miss four to six weeks with a sprained right knee ligament.
New York Islanders captain Michael Peca saw his first meaningful action of the season Thursday night in a game against the Boston Bruins, but left early after spraining a knee.