The former second-round pick is the only player drafted by the previous regime to get a new deal.
The extension is worth $74 million and includes more than $45 million in guarantees, a person with knowledge of the terms said. His $18.5 million average annual value over those four years ranks as the fifth-highest among NFL guards.
Cosmi’s extension is the first awarded to a player drafted by the previous management regime (2020-23) and ensures he stays in Washington without hitting the open market; he was set to become a free agent in March after his rookie deal expired.