2018 NFL Free Agency: Star rating is out of five. Age listing as of Sept. 1, 2018.
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Matt Paradis (RFA), C, Broncos. Age: 28.
Matt Paradis had a Pro Bowl-caliber 2016 campaign, but regressed this season, probably because he had a hip injury that he recovered from in the spring. Paradis should be able to rebound in 2018 and perform on a high level.
John Sullivan, C, Rams. Age: 33.
John Sullivan was once a very skilled center for the Vikings. He was a backup for a while after that for some reason, but the Rams gave him a chance to start, and it paid off. Sullivan had a strong 2017 campaign, but he's 33 and bound to regress at some point in the next 2-3 years.
Weston Richburg, C, Giants. Age: 27.
Weston Richburg is a talented center, but it's scary that he missed most of 2017 with a concussion. He played in just four games with the head injury, which doesn't bode well for his future.
Travis Swanson, C, Lions. Age: 27.
Travis Swanson is a skilled center, and if it weren't for major health concerns, he'd be rated higher. However, he has missed a lot of time with concussions, and it's fair to wonder how much longer he'll be able to play.
Brett Jones (RFA), C, Giants. Age: 27.
Brett Jones did a solid job in relief of an injured Weston Richburg this past season. He's passable as a starter, but would ideally be a strong backup.
Greg Mancz (RFA), C, Texans. Age: 26.
Greg Mancz did well as a backup center for Nick Martin in 2016, but didn't fare nearly as well at guard this past season.
Ryan Jensen, C, Ravens. Age: 27.
Ryan Jensen did a decent job as Baltimore's starting center in 2017, but he could stand to be upgraded.
Spencer Long, C, Redskins. Age: 27.
Russell Bodine, C, Bengals. Age: 26.
Wesley Johnson, C, Jets. Age: 27.
Luke Bowanko, C/G, Ravens. Age: 27.
Daniel Kilgore, C, 49ers. Age: 30. -- Re-signed with 49ers (3 years, $12 million)