New to the team: None
For the fourth consecutive summer, the Detroit Lions have Dominic Raiola, Dylan Gandy and Dan Gerberry on their roster at center. Raiola has always emerged as the starter from this group, and Gandy has been the backup. Gerberry has spent each of the last three seasons on the practice squad, meaning this year it's the 53-man roster or bust for him. (He is no longer eligible to be signed to the practice squad.)
The only battle at this position will really be between Gandy and Gerberry for the backup job. There have been a lot of calls for somebody to replace Raiola, but it doesn't appear that the Lions have any plans to do that right now. He should be back again as the starter, leaving Gandy and Gerberry to compete for the backup spot on the depth chart.
A big reason why Gandy has emerged as the backup in past seasons is because he is able to move over and play offensive guard in addition to center. That versatility has been key in him making the roster. I'm sure Gerberry can play both positions as well, but Gandy's effectiveness at center and guard is why he has made the team over Gerberry in the past.
Need going forward?
Regardless of who makes the team, the Lions will need to look elsewhere if they want to sign a center to the practice squad with none of the three currently on the roster being eligible. Aside from that, there isn't much of a need at this position right now.