Armstead, 27, is a former first-round pick out of Oregon by the 49ers in the 2015 NFL Draft. He was in the final year of his four-year, $9.84 rookie contract when the 49ers elected to pick up Armstead’s fifth-year option for the 2019 season.
Armstead was in line to be an unrestricted free agent in 2020 for the first time in his NFL career when he signed a five-yeara, $85 million deal to return to the 49ers.
In 2020, Armstead has appeared in nine games for the 49ers and recorded 22 tackles, 1.5 sacks and two passes defended.
Grasu, 29, is a former third-round pick of the Bears back in 2015. He was in the final year of his four-year, $3.44 million contract that included $814,855 guaranteed and set to make a base salary of $705,000 for the 2018 season when the Bears waived him coming out of the preseason.
Grasu had a brief stint with the Ravens in 2018 before signing on with the Dolphins in December. He was waived a few weeks later and eventually signed by the Titans.
He had a brief stint with the Ravens before catching on with the 49ers this summer.
In 2020, Grasu has appeared in six games for the 49ers, making three starts for them.