The Islanders placed Ritchie (lower body) on injured reserve Monday, retroactive to Oct. 17.
The Islanders announced last week that Ritchie would be sidelined approximately 4-6 weeks due to his lower-body injury, so his placement on injured reserve doesn't come as a surprise and won't impact his timeline. Mitchell Chaffee will likely continue to see increased playing time while Ritchie is unavailable.