The tight end impressed scouts at the Combine with his overall athleticism after a shaky start to his career.
Posluszny announced his retirement via a heartfelt letter released by the Jacksonville Jaguars on Tuesday morning.
After spending his first four seasons with the Jacksonville Jaguars, free agent receiver Allen Robinson is reuniting with fellow Nittany Lion Adrian Amos in Chicago.
The likelihood of the former Penn State standout going No. 1 overall became even more likely Friday evening.
The star running back certainly won't be evaluated as a quarterback, although he did complete both of his pass attempts in college.
The annual caravan will be visit New York City, Philadelphia, and Washington, DC from May 8 to 10.