YOUNG Gold Coast defender Sean Lemmens has signed a deal that will tie him to the Suns until at least the end of 2018.

Lemmens' two-year extension mirrors that of fellow defender Adam Saad, who inked his contract earlier this week.

After playing 36 games in his first two seasons, Lemmens is one of just six Suns to play all 10 matches this season and is seen as a key pillar of their young defensive unit.

"It is no secret to anyone that knows me that the Gold Coast has become my home away from home, so to continue to live out my AFL career in Queensland is an opportunity I don’t take for granted," Lemmens said.

"The club has been incredibly supportive in my three years."

The 21-year-old South Australian said he was keen to see the Suns develop a winning culture.

"It goes without saying that we’ve had a rough time of it with injuries but to be honest, that’s not an excuse," he said.

"Everyone involved in the club is acutely aware of the responsibility we all have to the Gold Coast community, the AFL and our fans to perform both on and off the field." 

Suns list and strategy manager Scott Clayton said he was thrilled to lock away another young player.

"His fearless attack on the footy, strong work ethic and competitiveness is often highlighted by his teammates and coaching staff," Clayton said.

"We’re absolutely excited about his future, and strongly believe we are building towards sustained success for years to come."