Matheson will be sidelined for Tuesday's clash with Philadelphia with an upper-body injury, Eric Engels of Sportsnet reports.
Matheson is considered day-to-day, so he may not be out long term. After racking up 62 points in 82 regular-season games back in 2023-24, the veteran blueliner managed a mere 31 points last year and seems closer to that level of production in 2025-26. In his last nine outings, the Quebec native has managed just one point while generating 12 shots and 18 blocks.