ST KILDA has added behemoth and former US college basketballer Sam Alabakis to its list as a Category B rookie.

At 211cm, he matches Fremantle stalwart Aaron Sandilands and Collingwood's American sensation Mason Cox as the tallest players to ever be on an AFL list.

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Alabakis was born in Perth but spent the past three years at the University of Louisiana Monroe.

The 21-year-old was thrilled to be joining the Saints.

"I couldn't be happier to be joining St Kilda," Alabakis told saints.com.au.

"I never thought I'd get the chance to play AFL, but the club has been really encouraging and welcoming.

"I can't wait to get started and repay the faith they've shown in me."

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Alabakis was previously on the development squad of NBL side Perth Wildcats and was scouted by St Kilda assistant coach Adam Skrobalak.

"His height is obviously a huge advantage, but his kicking abilities and natural athleticism have been among some really promising early indicators," list manager James Gallagher said.

"Sam has played rugby before, so has a good tackling base, and doesn't mind body contact. He obviously knows what it's like to train like a professional athlete, having played basketball at such a high level.

"He's used to 360-degree movement, reads the ball well and his skill at ground level is really good, especially for someone so tall.

"Sam is very mature for his age and has already shown an impressive level of professionalism and eagerness to learn. We're very much looking forward to having him on board."

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St Kilda's ruck stocks are thin after Tom Hickey was traded to West Coast.

Billy Longer and Lewis Pierce are expected to sign new deals while Rowan Marshall can also play ruck, although he is more of a forward at this stage of his career.