Brock, 29, has bounced around the NFL with 10 different teams since originally joining the Carolina Panthers as an undrafted rookie out of Rutgers in 2009 – mostly on practice squads and offseason rosters. But he finally started to see significant playing time over the past two years with the Kansas City Chiefs and Cincinnati Bengals.
The 6-foot-5, 264-pounder is primarily a run blocker. He has 11 career receptions for 91 yards in 22 career games played, including the playoffs. He had six of those catches for 28 yards in 15 games played with the Bengals last year. Brock re-signed with the Bengals earlier this year but was released after they drafted two tight ends.
Manhart (6-4, 298) originally signed with the Philadelphia Eagles after this year’s draft but was released when they signed a veteran guard in June. Manhart played left tackle at Division II Nebraska-Kearney but projects as a guard in the NFL.