EUGENE -- Oregon has lost a key member of its starting offensive line .
Freshman left tackle Penei Sewell is out for "approximately six weeks due to a high ankle injury" suffered in Saturday's win against Washington, the program announced Tuesday morning.
"Penei is a relentless competitor and I have no doubt he'll return better than ever," Oregon coach Mario Cristobal said in a statement.
The Oregonian will update this story.