The Jaguars drafted the former Oklahoma State star with the fifth pick in last week's NFL draft, hoping he can upgrade the league's worst offense.
Blackmon spent the first two days of the three-day camp getting familiar with coaches, teammates and plays. He spent Sunday watching from the sideline.
Coach Mike Mularkey says Blackmon had "general soreness in the foot" and the team is "being precautionary with this camp." Mularkey expects him to be ready to practice again when organized team activities begin May 15.
Mularkey adds that "we just thought this would be smart on our part and his part if we just held him out of the drills."