Coach Gus Bradley said Monday that Jack will play more Otto -- what the team calls its strongside linebacker -- going forward. Jack started at that spot in the Jaguars’ 30-27 victory over Indianapolis on Oct. 2.
"He did some really good things [against the Colts]," Bradley said. "There’s a couple plays [where he made mistakes]. He has to understand that when teams see that on tape they’ll keep attacking him, so we need to see those corrections made.
"We’ll continue to evaluate that [and] see how it goes this week."
Jack had four tackles and a pass breakup while subbing for starter Dan Skuta, who was out with a hip injury.
Skuta practiced on Monday, and early indications are that he will be able to play on Sunday in Chicago, so how a rotation with Jack would work -- if there is one -- will play out throughout the week. Skuta also has taken reps at the Leo (pass-rushing end) position.
The Jaguars started Jack at middle linebacker so he could learn the defense behind starter Paul Posluszny. He spent all of camp and most of the preseason there until the Jaguars moved him to weakside linebacker for the final preseason game. Jack didn't start working at Otto until the week before the Jaguars' game against Indianapolis.
However, the Otto position really doesn’t fit Jack’s strengths as a coverage linebacker. Plus, the Otto goes off the field when the Jaguars are in nickel, so Jack generally won’t be on the field a lot because the Jaguars are in sub defenses about half the time. That package uses two linebackers, and Bradley said middle linebacker Paul Posluszny and weakside linebacker Telvin Smith are playing at a very high level, so he doesn't want to take them off the field.
Still, getting Jack on the field at Otto is progress. Jack had played mainly special teams through the first three weeks, with the exception of getting reps on defense in the fourth quarter of the Jaguars’ 38-14 loss to San Diego in Week 2.