Raiders coach Dennis Allen hasn't told Terrelle Pryor or Matt Flynn who won the starting quarterback job - "sooner rather than later" he promised - but he has their blind side taken care of.

Allen said he "would anticipate" rookie Menelik Watson starting at left tackle in the season-opener on Sept. 8 after being "impressed" by how Watson looked in the preseason finale in Seattle on Thursday.

The 6-foot-5 315-pound Watson had never played left tackle and had participated in only one padded practice after missing all but the last day of training camp with a calf strain. The second-round pick held his own in the 22-6 loss to the Seahawks and didn't have any penalties.

"I thought he looked comfortable over there" Allen said. "I thought he played hard I thought he played physical. I wanted to see if he finished plays and he did that."

Pryor meanwhile had a quarterback rating of 9.9 (3-of-8 passing for 31 yards and an interception) but Allen may have tipped his hand by saying those numbers weren't important.

"You want your quarterback to be able to make plays" Allen said. "It really doesn't matter what the box score says at the end of the game how many yards they ran for or how many completions they had. What it really boils down to is how they move the team."

Flynn sat out Thursday's game with a sore arm so he and Pryor both finished with a total of 13 preseason possessions. Pryor led Oakland to 32 points and Flynn - going against primarily first-team defenses - came up with only 10.