Detroit will save $5.5 million in cap space as the move came shortly after the team traded running back David Montgomery to the Houston Texans.
Glasgow, 33, released a full statement on social media. He spent the first four years (2016-2019) with the Lions before eventually returning to them for three more seasons (2023-2025).
He spent time with the Denver Broncos (2020-2022) in between tenures with the Lions.
Glasgow gave up 19 quarterback pressures, eight quarterback hits, and one sack in 517 pass block snaps, while committing two penalties - tied for the fourth-fewest among centers.
Usually a solid run blocker, Glasgow finished 2025 with the fifth-worst run blocking grade (54.3) among all centers - the worst of his career. However, his 98.0 pass-blocking efficiency was the third-highest of his career.
He will now be one of the bigger interior offensive lineman names on the market when free agency begins.