Head coach Pete DeBoer said Monday that Ritchie (lower body) won't play this week, Andrew Gross of Newsday reports.
Ritchie sustained a lower-body injury during Saturday's matchup against Toronto, and he's facing a multi-game absence. Matias Maccelli (lower body) has also been ruled out this week, so Kyle MacLean and Mitchell Chaffee will likely have opportunities to step up for the Islanders over the next few games.