Stinchcomb had been working more extensively with the first unit in recent practices while many assumed Treu would slide into the position in place from Robbins, who is still working back slowly after undergoing arthroscopic knee surgery.
Treu, however, will start Friday's exhibition opener at home against the St. Louis Rams while Robbins has been ruled out for this contest. Stinchcomb and Blaine Saipaia will follow Treu in the rotation.
"We're going to start Treu at center and deservingly so," Raiders head coach Bill Callahan said. "We've been through an entire camp and Adam has served us very well in that capacity."
Other plans of note for St. Louis
Callahan said starting quarterback Rich Gannon would play a "series or two" with backup Marques Tuiasosopo getting an extensive look. How soon Tuiasosopo enters the game will depend on how well the first series goes.
Callahan added that cornerback Nnamdi Asomugha, who has been slowed by a shoulder injury, has been ruled out of Friday's game. Cornerback Phillip Buchanon, who is Oakland's top punt returner, continues to be slowed by a hamstring injury. Callahan added that Willie Quinnie, Charles Pauley, Marcus Knight and Justin Fargas would get a look at the punt return job.
Mirroring season schedule
Most games in the exhibition season may not be the same as the regular season but the Raiders have tailored their practice schedule to the "in-season" form.
Oakland went to the two-a-day format Monday and Tuesday with the morning session being in pads and the afternoon in shorts, jerseys, and helmets. The Wednesday portion was two lighter sessions. The Raiders will have a brief walk-through Thursday morning before bussing to Oakland.
"The way we designed the schedule is that it mirrors what we do in-season," Callahan said. "What you see is a Wednesday and Thursday format taking place Monday and Tuesday. We're trying to mirror in-season schedule and get it to reflect what we do in-season."
Vince D'Adamo can be reached at firstname.lastname@example.org