JACK Lukosius has continued a great off-season for Gold Coast, signing on with the Suns until 2022.

The 19-year-old's signature puts an end to speculation he may look for a return to South Australia and comes just weeks after fellow 2018 draftee Ben King also secured his future.

Gold Coast has now locked away its three top-six picks from last year's draft – Lukosius, King and Izak Rankine – for at least the next three seasons.

"Over the off-season I took the opportunity to reflect on my first year at AFL level and that made making the decision an easy one, I've loved my time at the club so far," Lukosius said.

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"We've got a great group of players, who are all committing to the future of this football club and I can't wait to be a part of it.

"The way everyone at the club has made my family and I feel welcome has definitely helped with the transition to becoming a professional footballer in the AFL.

"The challenge now is to put my head down, continue to work hard on developing my game and ensure I'm ready to play my role for the team on field in 2020."

Lukosius had an excellent first season, playing 21 games and spending time as both a key forward and versatile defender.