Breaking down the Detroit Lions position battles and depth chart entering the preseason matchup with the Miami Dolphins

Bootle left Wednesday’s practice due to a lower leg injury. The cornerback played 36 defensive snaps in the Hall of Fame Game, then another 22 last Friday in Atlanta.

Arnold had not practiced since he pulled a hamstring in the Lions' intrasquad scrimmage July 29.Start the day smarter. Get all the news you need in your inbox each morning. Lions coach Dan Campbell said before practice Wednesday he was "shooting for next week" for Arnold's return.

The Lions added OL Zack Johnson and CB Allan George, replacing two players lost to I.R. after the first joint practice with the Dolphins

The Lions quarterback enjoys the challenge of facing his team's defense in practice but enjoyed getting to root for them against the Dolphins.

Preseason games are for the hopefuls. The Detroit Lions’ first-team units got some good work in this week, taking on the Miami Dolphins in joint practice. The offense found its rhythm, the defense carried over its intensity and Dan Campbell had to have been satisfied with the two-day period.

The Lions reserves made a lot of plays but also too many mistakes in penalty-filled preseason loss to the Dolphins

Arnold is expected to be eased back into practice on Thursday, while LaPorta is expected to "miss a little bit of time here."