The 31-year-old triggered a clause in his existing contract across the first month of the season that allows him to play on automatically in 2018.
However, the 265-game midfielder said he would only go around again if he believed he still remained a valuable team member and could help an emerging squad achieve something special.
Mundy made the concession as he prepares to return to Fremantle’s line-up for tomorrow’s western derby. He missed last Sunday’s away win over North Melbourne with a nasty virus that left him bed-bound in Melbourne for almost 48 hours.
Asked if he was definitely going to play on in 2018, Mundy said: “At this stage, yes.”
“I haven’t really thought about it too much to be honest, but I think you get to my stage of a career and I don’t just want to roll on and continue for the sake of it or because I’ve been doing it for so long and it’s an easy decision to roll on,” he said.
“I want to really contribute and be a valuable member of the team, try and really achieve something. I don’t want to just cruise through 2018.”
Mundy has averaged 22 disposals and booted 10 goals in 2017 after being rejuvenated in a more versatile role that has involved spending more time forward to complement an inexperienced attack.
He predicted Connor Blakely and Lachie Weller would soon replace him as long-term midfielders.
Having declared pre-season that he wanted to play finals this year, Mundy said whether Fremantle stayed ahead of the curve in their list rebuild would hinge on their core group continuing to play on the edge.
“When the club might talk about a four-year rebuild, I think it’s quite easy mentally for individuals to coast,” Mundy said.
“It’s a really easy mentality to sit back and coast and then before you know it say ‘I can’t believe it’s round 17 or 18’.
“It’s trying to be on that edge of continual improvement and growth.”