Campbell also emphasized there's room for improvement for the Lions’ No. 1-ranked offense (33.2 points/game) from last season. Although the then-Ben Johnson-led unit had no problem scoring points, Campbell would like the now John Morton-guided offense to get better converting on third-and-short this upcoming season.

The Detroit Lions had their third practice of training camp on Tuesday and we saw a first: head coach Dan Campbell kicked a Lions defensive back out of the session. Here's why.

Two Detroit Lions backups, defensive tackle Roy Lopez and running back Sione Vaki, are expected to be out for a few days, coach Dan Campbell said.