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The Jaguars gave middle linebacker Paul Posluszny a veteran day on Wednesday and that became an opportunity for rookie Myles Jack.

The second-round pick dropped to the Jaguars because of concerns about his knee, but his on-field work showed a player who should have gone much earlier. He hasn’t gotten a chance to do much with the Jaguars yet because his availability during OTAs was limited by the end of UCLA’s school year, but he was bumped up to the first team in Posluszny’s place on Wednesday.

“I knew after that first rep that I was going to have to play even faster,” Jack said, via the Florida Times-Union. “It’s an adaptation to this game. That’s kind of the fun part about it. You never have it figured out — ever. To get those reps with the 1s, that’s big. It really showed me where I need to be, where I have to get to and how crisp I have to get.”

Posluszny and defensive coordinator Todd Wash both complimented Jack’s work, with Posluszny noting that Jack got the defense set up without any problem. Middle linebacker may be where Jack lands eventually, but another spot seems likely as a rookie as long as Posluszny is healthy. With Wash seeing “improvement every day,” Jack’s first-team work is likely to increase wherever he’s lining up.