The Bills also released WRs Gary Jennings and WR J.J. Nelson from their practice squad.
Stills, 28, is a former fifth-round pick of the Saints back in 2013. He spent two years in New Orleans before he was traded to the Dolphins in return for a third-round pick that became CB P.J. Williams and LB Dannell Ellerbe.
Miami later traded Still to the Texans last year. He was in the final year of his four-year, $32,000,000 deal and stood to make a base salary of $6,975,000 for the 2020 season when Houston waived him a few weeks ago.
In 2020, Stills has appeared in 10 games for the Texans and caught 11 passes for 144 yards receiving and one touchdown.
We had him included in our Top 50 Available 2020 Free Agents list.
Kroft, 28, 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.
Kroft signed with the Bills in 2019 on a three-year, $18.75 million deal in 2019.
In 2020, Kroft has appeared in 10 games for the Bills and caught 12 passes for 119 yards and three touchdowns.