Lions sign Shamari Benton, release Justin Jackson

The Detroit Lions may have just played in Oakland on Friday night, but they're already back at work with an afternoon practice on Saturday. The front office is also already back at work, as the Lions made a change to their roster on Saturday afternoon. Specifically, they signed linebacker Shamari Benton and released linebacker Justin Jackson.

Benton is an undrafted free agent out of Central Michigan. He actually took part in the Lions' rookie minicamp back in May as a tryout player, and now he's getting a chance to officially join the team. At Central Michigan, he finished his career with 307 total tackles, and with the Lions, he will try to make a big enough impression in the final weeks of the preseason to get into the mix for a spot on the practice squad.

Jackson departs the Lions after joining the team in May as an undrafted free agent. He had two tackles and one pass defense in the Lions' preseason opener last week, and he didn't record any stats on Friday night in Oakland.

With the Lions making an even swap at linebacker, they still have 90 players on their roster, but that will change later this month. On Aug. 26, the Lions will have to trim their roster down to 75 players, and they will have to get down to 53 players on Aug. 30.