He is expected to take up the backup duties to another former Rams quarterback in Sam Bradford with there still no timetable available for Teddy Bridgewater's return from his serious knee injury last he suffered last August.
Keenum had started the first nine games of the 2016 regular season for the Rams throwing for 2,201 yards with nine touchdowns and 11 interceptions. His 76.4 passer rating ranked him 27th in the NFL while he was 23rd in yards per completion (6.84) and 22nd in completion percentage (60.9) among qualified quarterbacks last season. According to Pro Football Focus, he graded 28th both overall (49.6) and in passing situations (46.9) at his position.
The 29-year-old's porous play as the season wore on lead to the Rams deciding to give the reigns to rookie Jared Goff in Week 11 against the Miami Dolphins. He spent the remainder of the season as the primary backup with his lone appearance coming against the Seattle Seahawks in Week 15 where he completed 5-of-9 passes for 32 yards.
Keenum's departure became expected after Los Angeles decided to ink former Kansas City Chiefs quarterback Aaron Murray to a deal earlier in the free agency period. Murray is expected to compete for the backup spot behind Goff.