Smyth is day-to-day after practising on a limited basis since a 3-2 loss to New Jersey on Tuesday. Smyth has four goals and nine assists in 13 games with New York. The high-scoring left-wing acquired from Edmonton at the NHL trade deadline last month
The Islanders are already without starting goalie Rick DiPietro, who's out indefinitely after missing his second straight game because of a concussion.
New York entered Friday's game with 84 points, tied with Carolina for 10th in the Eastern Conference standings. The Islanders are in a tightly contested race between six teams separated by three points, vying for the final three playoff spots heading into the final week of the season.
The Islanders continued adding players, signing defenceman Deron Quint on Friday. Quint, a nine-year NHL veteran, spent the past three seasons playing in Europe and must clear 24-hour waivers before being allowed to play for the Islanders.
Quint last played in the NHL for Chicago in 2003-04, when he had four goals and seven assists in 51 games.
Defenceman Todd Simpson, signed Thursday, cleared waivers and will be eligible to play Saturday when New York hosts Ottawa. A 10-year NHL veteran, Simpson spent this past year playing in Germany.
Neither Quint, should he clear waivers, and Simpson would be eligible to compete in the playoffs.