ENGLEWOOD, Colo. -- The Broncos' roster now stands at 90 players.
On Monday, the team announced six transactions, including three signings, to reach the offseason roster limit.
Safety Charles Mitchell, linebacker Chase Vaughn and wide receiver
Hardin started 39 or 42 career games at the University of North Dakota, totaling 221 receptions for 3,583 yards and 32 touchdowns.
Mitchell, a second-year player who was waived by the Broncos last week before being brought back on a tryout basis during last weekend's rookie minicamp, was originally selected by the Falcons in the sixth round of the 2012 NFL Draft.
Vaughn is an NFL rookie who has competed in the Arena Football League, United Football League, Canadian Football League and Indoor Football League. Colorado State-Pueblo's all-time sacks leader was also a tryout player during last weekend's rookie minicamp.