Chris Johnson is sending a stern warning to Jerry Jones ... if ya let Ezekiel Elliott's contract holdout continue -- it could lead to the running back's career-worst year!!!
Of course, CJ2K would know that best ... the legendary RB says when he held out for all of training camp before the 2011 season -- it contributed to him having the worst season of his Titans career.
"You can train all you want to train, but until you're actually out there playing football and doing all those stuff and instant moves and stuff, you'll never be in football shape until you do it.