ALLEN PARK, Mich. -- The Detroit Lions are done with public practices after Tuesday afternoon's workout. By Friday morning, half of the team’s preseason games will be completed. While a large part of the team’s roster is already pretty set -- in part due to having a lot of returning veterans from a strong team last season -- there are some places where moves can be made.

A pair of Georges showed last season what a strong camp can do. George Johnson made the team outright as a defensive end and had a career year with six sacks. George Winn bowled over defenders in practice, earned a practice-squad spot and was promoted to the 53-man roster by the end of September.

Here are some guys to watch this week -- and the rest of the preseason -- as potential roster spot surprises for the Lions (in order of potential possibility right now).

DT Jermelle Cudjo: The former St. Louis Rams lineman has 38 games of experience and 44 career tackles. He’s not supplanting any of the top four tackles (Haloti Ngata, Tyrunn Walker, Caraun Reid or Gabe Wright) but he keeps making plays in practices, scrimmages and the preseason opener. Every day like that will make it harder for Detroit to cut him. His biggest issue -- beyond the four guys in front of him -- might be that Jason Jones, Devin Taylor and Darryl Tapp can all play end and tackle if necessary.

OL Taylor Boggs: The former Chicago Bears interior lineman played more offensive snaps than any other Lions player in the opener. Part of that was due to Darren Keyton's knee injury, but he has been consistently good throughout camp -- particularly during the one-on-one offensive-defensive line pass rush drill. In a drill slanted toward defensive linemen winning, Boggs has held his own in solo pass pro. He also has position flexibility and practice squad eligibility. Like Cudjo, he’s not supplanting the guys in front of him -- Travis Swanson, Larry Warford, Manny Ramirez and Laken Tomlinson -- but if the Lions choose to go offensive-line heavy, he has a real chance.

LB Brandon Copeland: He still has a long way to go at a very, very deep position, but he received a lot of special teams work in the preseason opener. While it should be concerning that he received no defensive snaps, the Lions only had 44 defensive plays to work with -- likely shortening their defensive rotations. He is still a longshot, but pay attention to where he fits into the linebacker rotation Thursday against Washington. That could give an idea if he is starting to make a true depth chart move. He also has taken reps in the one-on-one line drill mentioned before with his hands on the ground as a defensive end, so the coaches are clearly looking at him in multiple roles. Like Boggs, he should be practice squad eligible.

WRs TJ Jones and Greg Salas: Both had strong preseason openers -- Jones as a returner and Salas as a receiver. The majority of that work came against second-and-third teamers, though, so it should be taken with that understanding. Neither had stood out consistently during practices beforehand, although Salas once again made plays Saturday. However, in a somewhat crowded receiver field with no one truly separating themselves beyond the starters, both have a shot if they remain consistent.

CB Crezdon Butler: This is a fairly deep position and, truthfully, he hasn’t stood out much during camp. But the Lions have a dearth of taller cornerbacks and true outside corners. He’s a veteran, which could also help him here. If Alex Carter is able to get back healthy, then this becomes highly unlikely. If he doesn’t, the Lions might try to keep another outside corner at the expense of a position elsewhere. Butler or R.J. Stanford would be those guys.