Caldwell said the team has not heard from Blackmon recently, and his 21-month respite from the NFL makes it doubtful he will ever play again in the league.
“I have not heard anything, and I guess I harbor a little bit of hope, but realistically I think when you're away from the game for two-and-a-half years what you were once is not what you probably will be,” Caldwell said. “Your skills do erode and especially if you're not staying in tip-top shape and you're not in football shape.”
Blackmon hasn't played or practiced with Jacksonville since Week 8 of the 2013 season, when the NFL suspended him indefinitely for his third violation of the league's substance-abuse policy. Before he can get back on an NFL field, Blackmon must apply for reinstatement into the league and then endure a two-month vetting process to determine if he will be allowed to return.
• Jacksonville Jaguars training camp schedule
The fifth overall pick in the 2012 NFL draft, Blackmon caught 64 passes for 865 yards and five touchdowns as a rookie. Blackmon failed an offseason drug test in 2013 and was subsequently suspended for the first four games of the season. He returned to the Jaguars for Weeks 5-8 and made 29 catches for 415 yards and one score before violating the league's substance-abuse policy.
Blackmon has not been cut by Jacksonville, and Caldwell has said the team does not plan on doing so. Because Blackmon is on the reserve/suspended list, he does not count against the team's roster limit or salary cap. His contract was paused upon suspension.
Blackmon has 2 1/2 years remaining on his 4-year, $18.5 million contract with Jacksonville, pending his return to the NFL.
- Kayla Lombardo