Based on the wiki, there's no indication Sam Darnold is injured or questionable for this week. He enters the 2026 season as the starting quarterback for the defending Super Bowl champion Seahawks, and the team opens Week 1 against the New England Patriots on Wednesday, September 9 (from the Seattle Seahawks page and Sam Darnold page).
However, I should flag one thing: The Fantasy Headliners clip (from a video titled "SMASH SPOTS") mentions that "Sam Darnold, AJ Brown, they're injured in the opener" — but that appears to be two games into the season based on the context, and the wiki itself doesn't list any injury or change in Darnold's status. He's been healthy and participating fully through OTAs and training camp, with Coach Macdonald and OC Fleury emphasizing continuity.
Bottom line: All signs point to Darnold playing and starting this week vs the Patriots. I'd keep an eye on official Friday injury reports just in case, but nothing in the wiki suggests he's at risk of missing the game.