Cardinals head coach Jonathan Gannon said Saturday that Jackson picked up a thumb injury during Saturday's 20-17 preseason win over the Chiefs, Josh Weinfuss of ESPN.com reports.
Jackson failed to secure his only target during Saturday's preseason win. As he continues to compete for a depth wide receiver spot on Arizona's final 53-man roster, Jackson's next task will be to get healthy in time for the Cardinals' next preseason clash, Saturday, Aug. 16 versus the Broncos.