Carlton star Chris Judd will play on next season but is uncertain how much longer he’ll stay in the AFL.

The decorated 29-year-old has re-signed for 2014, saying he remains physically and mentally in top shape and has plenty to contribute.

But the two-time Brownlow Medallist said at this stage of his career it was a year-by-year proposition and he couldn’t predict how he would be feeling when his new contract expires, by which stage he’ll be 31.

“There’s just so many variables you can’t control,” Judd told Carlton’s website.

“Whether or not you have any success, how your body’s feeling, how your mind’s feeling, a myriad of options, how your form is.

“It’s really not something you can predict and you’re probably better off not even trying to.

“You’re better off enjoying what’s happening now and enjoying that and assessing things at the end of the season or whenever’s appropriate.”

Judd has played 111 games with the Blues, captaining the club from 2008-12, after playing 145 games with West Coast, including skippering the Eagles to the 2006 premiership.

The five-time best and fairest (two with the Eagles, three with Carlton) said just as switching to the Blues had helped invigorate him mentally, Carlton’s change to a new coach Mick Malthouse this season had also been refreshing.

“Any time you change scene, change coaches or move to a new club, you certainly have to earn the respect of the new people all over again,” Judd said.

“I think that’s healthy when you’ve been in the system for a while.

“It’s a fresh challenge and something I’ve really enjoyed.”

He said he was excited by the direction Carlton was heading and the maturing of his teammates.

Carlton football manager Andrew McKay said Judd remained a key part of the Blues’ future.

“Chris is respected as one of the elite players in the competition, one of the best of his generation and he continues to be a great asset to the club,” McKay said.

“We see him as an important figure in our team as it continues to strive for success.”