Bellamy was just activated from the injured reserve list on Tuesday.
Barron, 30, is a former first-round pick of the Buccaneers back in 2012. Tampa Bay traded him to the Rams in 2015 for fourth- and sixth-round picks.
The Rams ultimately declined to pick up his fifth-year option but re-signed him to a five-year, $45 million contract with $20 million guaranteed in 2016. Barron was owed a $3 million roster bonus last year, but the Rams elected to release him before it was due.
Barron ended up signing a two-year, $12 million deal with the Steelers before the 2019 season. Pittsburgh cut him to clear cap space this offseason and he eventually signed on with the Broncos in August.
In 2019, Barron appeared in 15 games for the Steelers and recorded 82 tackles, three sacks, one interception, a fumble recovery and three pass defenses.
Bellamy, 23, wound up going undrafted out of Western Michigan back in April. He later signed a three-year, $2.28 million contract with the Broncos, but was waived coming out of training camp.
The Broncos later added Bellamy to their practice squad and later added him to their active roster.
In 2020, Bellamy has appeared in three games for the Broncos but has yet to register a stat.