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The Packers will be without right tackle Bryan Bulaga when they host the Seahawks on Sunday night. How much longer they’ll miss one of their key starters remains unknown.

Bulaga left Thursday’s practice with a knee injury during individual drills. Coach Mike McCarthy said his right tackle is still being evaluated and would not share the severity of his knee injury.

“It’s never a good time in the week for it to happen obviously,” McCarthy said of the injury. “But you wouldn’t think it’s Thursday practice during individual drills. But it’s football. It’s unfortunate, and we’ll deal with it.”

McCarthy would not name a starting right tackle for Sunday’s game. The most likely choice would appear to be Don Barclay, who started 14 games at right tackle when Bulaga missed the 2013 season because of a torn ACL. Fellow backups Josh Walker and J.C. Tretter also are possibilities.

Barclay struggled early in camp while returning from a torn ACL last season, but he has apparently found his rhythm.

“When he first came back,” left guard Josh Sitton said, “you could tell he wasn’t quite himself, and he seems to be back to where he was now. So he’s all good.”

Bulaga was the only player on the Packers’ 53-man roster who was ruled out for Sunday’s game. The Packers will also be without inside linebacker Sam Barrington, who was placed on season-ending injury reserve (foot) on Tuesday.

The Packers listed safety Morgan Burnett (calf) as questionable for Sunday. Receiver Randall Cobb (shoulder) and outside linebacker Jayrone Elliott (quadriceps) as probable. All three are expected to play after practicing every day this week.

Seahawks linebacker Bruce Irvin (rib) is questionable this week. Defensive end Michael Bennett (ankle) and linebacker Bobby Wagner (ankle) were among players listed as probable because of injury.

Bulaga tore his MCL during the first half of last season’s opener in Seattle, his first game back after tearing his ACL in 2013. For a player with a significant history of knee injuries, the question is whether he’ll miss a substantial length of time.

“Knowing Bryan,” left guard Josh Sitton said, “it’ll be shorter than what they expect.”

-rwood@gannett.com and follow him on Twitter @ByRyanWood

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