Willis (concussion) has been ruled out for the remainder of Thursday's preseason matchup with the Raiders, Noah Furtado of the San Francisco Chronicle reports.
The tight end caught one pass for seven yards before leaving the game. The 2023 seventh-round pick is fighting for a roster spot with backups Jake Tonges and Luke Farrell Willis has seen action in each of the last three seasons with the 49ers, primarily on special teams.