JACKSONVILLE, Fla. -- Jaguars defensive tackle Arik Armstead is dealing with a back injury that puts his availability for the team's regular-season opener in doubt.

Armstead has missed the past three practices with what coach Liam Coen called a sore back. However, he had participated only in individual drills in the Jaguars' first eight practices because Coen said the team was allowing the 31-year-old to have a "veteran start."

But it looks like there's no concrete timetable for when the Jaguars could get Armstead back on the field.

"He's a veteran who, ultimately, he'll probably know how to get himself ready to go, I would hope," Coen said after Tuesday's practice. "The key is just making sure that he's healthy and ready to go for the first game. It's a long season as we know. Now

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