The Jaguars claimed Johnson off waivers Wednesday, Tom Pelissero of NFL Network reports.
Johnson was one of the more surprising roster cuts Tuesday, failing to make the Chargers' initial 53-man team despite posting a 20-398-3 receiving line on 26 targets last season. He's already 25 years old, but even if his development stalls, Johnson could perhaps be useful as a deep threat off the bench. He has a shot to be the No. 4 receiver in Jacksonville, where return specialists Jamal Agnew and Tavon Austin are the other wideout options behind DJ Chark, Marvin Jones and Laviska Shenault.