KNOXVILLE, Tenn. (AP) — Tennessee coach Butch Jones isn't allowing his players to speak to the media until they improve their practice performance.

Jones canceled a scheduled post-practice media session with nine players Monday and said he'd be the only team representative speaking with reporters. Jones said players would speak again when they "earn the right to talk to the media."

"I want all their focus on showering, getting up, eating dinner, working on their recovery and going right to meetings because we can't waste one single opportunity to improve this football team," Jones said.

Jones said the Volunteers' performance deteriorated in the latter portions of Monday's practice. Those portions weren't open to reporters.

Tennessee is relying heavily on a 32-man recruiting class and must replace all of last year's starters on the offensive and defensive lines as the Volunteers attempt to end a string of four straight losing seasons. Jones said that "leadership is at a premium right now. We don't have very many leaders."

"We have to stop using youth as a crutch, as an excuse," Jones said. "It is what it is. It's where we're at in the program. Nobody cares. Our opponents don't care. Everything's about a culture, a standard and an expectation."

Jones criticized the accuracy of Tennessee's passing game Friday after the Vols' opening workout, and he said Monday that the problem's grown worse.

"When we step out on the grass, it's two hours of mental effort and mental intensity in everything that we do," Jones said. "That's the standard. That's the expectation. That's the way we coach, and that's the way we're going to play around here. And when it doesn't meet up to those standards and expectations, there (are) repercussions."

NOTES: Jones said reserve defensive lineman Allan Carson has graduated and has left the football team. Carson played five games as a freshman in 2011 but hadn't appeared in a game since. ... Freshman Jashon Robertson, a two-way lineman in high school who had been on defense the first few days of training camp, worked out on the offensive line Monday. Jones said he wants to see how Robertson fares as a guard.