Kroft broke his foot on the first day of OTA’s and had surgery to repair the injury. He signed with the Bills in free agency this March on a three-year, $18.75 million deal.
All three still count against the 90-man active roster and can be activated at any time.
Gore, 35, is a former third-round pick of the 49ers back in 2005. He spent 10 seasons in San Francisco before signing a three-year, $12 million contract that included $7.5 million guaranteed with the Colts back in 2015.
Gore played out the final year of his contract before agreeing to a one-year, $1.015 million contract with the Dolphins last year. He signed a two-year, $5 million deal with the Bills in 2019.
In 2018, Gore appeared in 14 games for the Dolphins and rushed for 722 yards on 156 carries (4.6 YPC) to go along with 12 receptions for 124 yards receiving and one touchdown.
Kroft, 25, is a former third-round pick of the Bengals back in 2015. He finished the final year of his four-year, $2,971,276 rookie contract and became an unrestricted free agent.
He signed with the Bills in 2019 on a three-year, $18.75 million deal.
In 2018, Kroft appeared in five games and caught four passes for 36 yards receiving and no touchdowns.
Sirles, 27, originally signed on with the Chargers as an undrafted free agent out of Nebraska back in 2014. He was unable to make the 53-man roster during his rookie season and spent the year on the team’s practice squad.
The Chargers later traded Sirles to the Vikings in return for a 2016 sixth-round pick that eventually became FB Derek Watt. Minnesota brought Sirles back on an exclusive rights contract in 2017 but declined to tender him a contract as a restricted free agent last year.
The Panthers signed Sirles to a contract only to release him with an injury settlement at the start of the 2018 regular season. Buffalo signed him to a contract a few weeks later and gave him a one-year extension this offseason.
In 2018, Sirles appeared in 12 games for the Bills and played 140 snaps.