Fremantle ruckman Aaron Sandilands will be around for another season after signing a one-year contract extension that will see him remain at the Dockers until the end of 2018.

Sandilands will enter his 16th season at the club next year, and has played 253 games since he was taken with the 33rd pick in the 2002 rookie draft.

The 34-year-old has missed the past three weeks with a hamstring injury, but played Fremantle's first nine games this season and has averaged 45.7 hitouts a game, and is leading the AFL in that category.

The ruckman is still enjoying his football, and is excited to continue to play at the highest level.

“I haven’t been able to be out there for the past couple of weeks, but other than that my body is feeling really good. I’m very happy to be here for another 12 months,” Sandilands told the club's website.

“I was pretty confident that I would be able to get through another season and contribute strongly.

“It was an easy decision as I continue to love playing the game and I still feel like I can contribute to the side.

“Freo is a great club to be at. When you walk through these doors you walk out a better person. I owe a fair bit to the footy club.”

The Dockers have also signed young ruckman Sean Darcy, who has signed a contract extension to remain at Fremantle until the end of the 2020 season.

“It’s a big boost in confidence knowing that Freo’s wanting to stick with me, so I was really happy when they told me they wanted to sign me on,” Darcy said.

“There’s been a lot of learning - and learning really quickly - but you get used to it. You’ve got to adjust pretty quickly but once you’re used to it you can track along all right.

“I’ve found that there’s as much physical work as there is mentally. You learn a lot about the game, whether it’s about running patterns on the track or in the gym doing weights."