The Rams signed Johnson on Tuesday.
Los Angeles will be Johnson's third stop this calendar year after he was released by the Bucs in January, signed by the Raiders shortly after, and then cut by Las Vegas two weeks ago. The 24-year-old appeared in two games for the Texans last season but didn't earn a target on 29 offensive snaps. He'll try to revive his career in the Rams' depleted wideout room behind Cooper Kupp.