Both players had previously been promoted to the active roster this season.
Tuszka, 23, was drafted by the Broncos in the seventh round out of North Dakota State this past April. He signed a four-year, $3.4 million rookie deal but was waived coming out of camp and re-signed to the practice squad.
During his senior year, Tuszka had 48 tackles, including 19 for a loss, 13.5 sacks, one forced fumble, and five pass deflections in 15 games.
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.
In 2020, Bellamy has appeared in one game for the Broncos but did not register a stat.