This isn't much of a surprise, as Vanderdoes tore his ACL in December and isn't guaranteed to be ready to go for Week 1. While Vanderdoes is sidelined, second-round pick P.J. Hall could open training camp with the first-team defense.
General manager Reggie McKenzie recently indicated that Anderdoes (knee) is making "good progress" in his rehabilitation from a torn ACL, Jerry McDonald of the Mercury News reports.
Vanderdoes tore the ACL in his left knee during the regular-season finale and is uncertain to be back on the field in time for the start of the 2018 campaign. Considering he'll also need to get back into game shape once recovered, it's not out of the question for the 2017 third-rounder to begin his second professional season on the Physically Unable to Perform list, which would preclude Vanderdoes from playing in Oakland's first six games.
Vanderdoes season ended in about the worst possible way, and is likely to undergo surgery in the coming weeks. The rookie third-round pick will be lucky to be available for Week 1 of next season, given the at least nine-month recovery timeframe.
Vanderdoes (knee) is still practicing with the first-team defense, The San Jose Mercury News reports.
Vanderdoes has been listed as a starter on the unofficial depth chart since day one. The 2017 third-round pick was dealing with a minor knee injury last week, but played in the Raiders' first preseason game against the Cardinals, recording one tackle.