Del Rio even sent in second-year player Richard Collier for a few plays during the victory over Carolina Sunday in an attempt to motivate Barnes.
Although he indicated that Barnes will remain in the starting lineup, Del Rio called Collier "an ascending player" and said he "earned some playing time."
In his third season since being drafted in the second round of the 2005 draft, Barnes hasn't made the kind of progress the Jaguars were looking for this season.
He has also had some off the field issues, including a DUI arrest and an incident in which he crashed his car into a tree.
Collier also had an off-the-field issue earlier this season when he was suspended for two games after falling asleep at the drive through window of a fast food restaurant.
Collier was signed a year ago as an undrafted rookie out of Valdosta State and played in only four games.
He was either inactive or suspended for the first 12 games this year and his appearance in the Carolina game was his first of the season.
But if Barnes doesn't start playing better, Collier may be seeing more action.
Asking Barnes to Stand Up
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