Menelik Watson will have to wait another year to prove he's starting material.
The Raiders tackle suffered a ruptured Achilles against the Cardinals on Sunday night. He'll miss the entire 2015 campaign.
"That's a tough break for us," head coach Jack Del Rio told reporters. "It's really unfortunate. He was having a great camp for us."
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The former second-round pick was impressive this summer, according to Del Rio. He needed another year of reps to combat his relative inexperience -- 17 games played with 12 starts.