Pullard was a seventh-round pick by Cleveland in this year's draft. After being released during final cuts, Pullard re-signed to the team's practice squad and spent the first seven weeks of season there.
According to the Collective Bargaining Agreement, Pullard must remain on Jacksonville's 53-man roster for at least three weeks.
The Jaguars (2-5) signed Johnson on Oct. 5. He previously spent time with Cleveland (2012), Kansas City (2013-14) and Tampa Bay (2015). He has 88 career tackles, three passes defensed, two forced fumbles and a sack.
Also Wednesday, the Jaguars worked out kickers Randy Bulloch and Zach Hocker but didn't sign either of them.
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