Watson, the rookie who was making the conversion to the left side, injured a knee in practice on Wednesday and has not practiced since. Ausberry has been sidelined since the end of camp.
Rookie strongside linebacker Sio Moore (foot) was listed as questionable.
With Watson out, Khalif Barnes will slide over from right tackle to protect the quarterback’s blind side at left tackle, and Tony Pashos, who was signed on Monday, will start at right tackle. Barnes and Pashos once played together in that alignment in Jacksonville.
But with Watson and Jared Veldheer (left triceps) out, the Raiders have only two healthy tackles in Barnes and Pashos. As such, Oakland has to make a roster move to add another tackle -- perhaps signing Matt McCants off the practice squad -- and make room for said tackle, which would mean probably finally placing Veldheer on partial season injured reserve.
Coach Dennis Allen, though, said the team would not announce any roster moves until Saturday, and he would not elaborate on the severity of Watson’s injury.