The Buffalo Bills have agreed to bring back quarterback Mitch Trubisky following his release from the Pittsburgh Steelers, a source told ESPN's Alaina Getzenberg on Wednesday.

Trubisky was released by the Steelers on Feb. 12, a year after they signed him to a two-year extension. He spent the 2021 season with Buffalo, going 6-of-8 for 43 yards and rushing for 24 yards and a touchdown in limited action over six games.

Trubisky, 29, faltered as a backup in 2023 and was eventually benched for Mason Rudolph after throwing three picks to three touchdowns in a three-game stretch while Kenny Pickett recovered from an ankle injury and subsequent surgery. As Rudolph gave the offense a spark, Trubisky dressed as the No. 2 quarterback for two games and was inactive for the Week 18 victory over the Baltimore Ravens and the wild-card round loss to the Bills.

The Steelers initially signed the Chicago Bears' 2017 No. 2 overall pick on the first day of the 2022 free agency period before drafting Pickett at No. 20 overall a few months later.

After a quarterback competition through training camp, Trubisky started the first four games of the 2022 season before being replaced by Pickett at halftime of the Week 4 game against the New York Jets to give the stagnant offense a spark. Playing in relief of an injured Pickett, Trubisky appeared in three more games that season, going 2-1 in those outings.

As a Steeler, Trubisky appeared in 12 games, starting seven of them. He completed 64.1% of his pass attempts and threw eight touchdowns to 10 interceptions.

For his career, Trubisky has passed for 12,536 yards with 72 touchdowns and 48 interceptions in 69 games (57 starts).

ESPN's Brooke Pryor contributed to this report.