The Raiders placed Thornton (undisclosed) on injured reserve Monday.
It's still unclear what is bothering Thornton, but he'll now be required to miss at least the first four games of the regular season. The 2025 fourth-rounder corralled just 10 of 30 targets for 135 scoreless yards across 15 regular-season appearances as a rookie last season and missed the entire preseason this summer. Under a new coaching staff, it's unclear what kind of role Thornton will have this season once healthy.