The Saints will be keeping an eye on Sydney's Hayden McLean this off-season with the youngster facing a wait on his future.

AFL.com.au's Riley Beveridge reports that St Kilda are currently in the market to add support to star bigs Rowan Marshall and Max King.

Despite veteran Paddy Ryder likely to be offered another one-year deal, the 197cm McLean looms as a possible ruck-forward replacement into the future.

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McLean, who is uncontracted beyond 2021, has managed only the 19 games for the Swans across his three years at the club.

The 22-year-old has often struggled to break into a potent forward line alongside the likes of Lance Franklin, Isaac Heeney and Sam Reid.

McLean has shown exciting glimpses of his talent this season, including a four-goal haul against the Cats in Round 7 in what was a statement win for the Swans.

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Returning to the senior side last weekend in the absence of Franklin, McLean impressed again with 10 marks and a goal.

The young Swan has been on St. Kilda's radar for some time, having previously spent a season with the club's VFL affiliate Sandringham in 2018.

With St Kilda's Shaun McKernan retiring earlier this week and fellow tall Paul Hunter unlikely to be offered a new deal, McLean presents some much-needed key-position depth.

The Swans are yet to commit to McLean for a fourth season at the club.