Cosmi was drafted by the
Washington Football Team in the second round (51st overall) of the 2021 NFL Draft. He signed his four-year rookie contract on May 13, 2021.
2021 Cosmi was named the starting right tackle during
training camp and made his professional debut in the opening game of the season. In the second quarter, Cosmi left the Week 5 game against the
New Orleans Saints with an ankle injury. Cosmi missed the next four games until he returned against the
Carolina Panthers in Week 11. He left that game early due to a hip injury and would eventually be placed on
injured reserve on November 29, 2021. He was reactivated to the active roster on December 20 and finished out the season, though he missed the week 17 game against Philadelphia due to Covid. He played in nine total games total, all of which he started.
2022 Cosmi underwent thumb surgery following Week 4 of the 2022 season. After missing three games, Cosmi played with a club on his hand in Week 8 but in a reserve role with the Commanders choosing to stick with
Cornelius Lucas as the starting right tackle. In Week 13 against the
New York Giants, he started at right
guard before leaving in the third quarter with an ankle injury. He was again the starter for the last game of the year. He played in 14 games that season, starting 6 and playing more than half the team's offensive snaps.
2023 Cosmi remained at right guard for the 2023 season. He managed to remain healthy all season, starting all 17 games and playing in nearly 100% of the team's offensive snaps.
2024 On September 4, 2024, Cosmi signed a four-year contract extension worth $74 million with $45 million guaranteed. Cosmi again stayed healthy through the 2024 regular season and started at right guard for all 17 games; but he left in the first half of the
Divisional round game against the
Detroit Lions due to a knee injury. It was confirmed the next day that Cosmi tore his
ACL and would be out for the remainder of the 2024-25 playoffs. He had surgery in early February, 2025.
2025 On July 23, 2025, the Commanders placed Cosmi on the active/
physically unable to perform (PUP) list for the start of training camp. He remained on the reserve/PUP list at the start of the season. Cosmi was activated on October 18, ahead of Washington's Week 7 matchup against the
Dallas Cowboys. On December 22, the Commanders placed Cosmi on season-ending injured reserve due to a
concussion. == Personal life ==