UNHERALDED Adelaide midfielder Richard Douglas has penned a one-year extension to keep him committed to the club until the end of 2019. 

Despite being in his 13th season, the 31-year-old continues to play an important role, having averaged 19 disposals and one goal through his 11 matches.

The potential of a premiership drives him.

"I've always said being a one-club player is something that would be pretty special to me," Douglas told afc.com.au.

"We've got a highly determined playing and coaching group who are driven towards achieving the ultimate success.

"I still feel I've got some good footy ahead of me and to be able to continue playing at the club I've called home for more than a decade is great."

Douglas was drafted with the No.16 selection in 2005.

He won the best and fairest in 2010 and finished runner-up in 2013.

"Dougie is a former club champion who has shown he can get the job done at the elite level year-in, year-out," list manager Justin Reid told afc.com.au.

"He is a leader amongst our players and someone who always puts the team first in everything he does."

Star onballer Rory Sloane and gun forward Tom Lynch remain unsigned.