Future/reserve contracts are essentially an opportunity for players compete for a roster spot in offseason workouts and training camp.
Herron, 23, was take in sixth round of last year’s draft by the Buccaneers. However, he was waived with an injury designation coming out of the preseason and later ended up on Tampa Bay’s injured reserve list.
The Buccaneers later granted him his release before he signed on to the Dolphins practice squad in October.
In 2014, Herron appeared in eight games for the Bucs and caught six passes for 58 yards receiving and a touchdown.
Manning, 25, is a former fifth-round pick of the Green Bay Packers back in 2012. However, he lasted just one year with the team before he was placed on waivers.
Since then, Manning has played for a number of teams including the Chargers, Vikings, Giants, Dolphins, Bears, Bengals, and most recently for the Falcons.
In 2014, Manning appeared in four games and has recorded a single tackle.