The 40-year-old was appointed Suns coach in late 2017 and it's understood the new deal will keep him at the club until the end of 2022.

In the past two seasons the two-time premiership player has led the Suns to just seven wins in 44 games - four in 2018 and just three wins last year.

Dew is off contract at the end of the 2020 season but began negotiations with the Suns late last year.

"I've never been a massive contract person, even as a player - if you're playing well it will sort itself out and if the club's happy that will sort itself out," Dew told AFL.com.au.

"We certainly appear very close and it is down to minor details which I'm not involved in."

Despite the lack of wins in his tenure, Dew comes in to the 2020 campaign with several of his key players already tied down to long-term deals at the club.

Co-captains David Swallow and Jarrod Witts signed new deals before the 2019 campaign along with vice-captain Touk Miller.

They were also successful in retaining high-draft picks Ben King, Jack Lukosius and Izak Rankine.

"We've got a firm belief that this is the group that we've got, obviously at every footy club some players come and go, but in terms of the bulk of our list we certainly think that we've got the players," he said.

Australian Associated Press