ADELAIDE, AUSTRALIA - OCTOBER 10: Joshua Cripps of Western Australia has his kick smothered by Blayne O'Loughlin of South Australia during the 2021 NAB AFL Draft U19 Challenge match between South Australia and Western Australia at Thebarton Oval on October 10, 2021 in Adelaide, Australia. (Photo by Mark Brake/AFL Photos )

Carlton are understood to have decided on holding their last remaining AFL list spot for June's Mid-Season Rookie Draft, meaning a trio of train and trial players won't be offered a rookie spot in Michael Voss' squad.

Josh Cripps, Tyreece Leiu and Michael Lewis have all trained under Voss this pre-season in hope of securing the sole list spot on offer through the Supplemental Selection Period.

The Blues' remaining list spot was opened following the retirement of veteran defender Liam Jones, with Carlton looking to potentially fill the void left by the key backman.

However, the club has decided to go against recruiting any of the three train-on players for the year ahead, according to AFL.com.au's Riley Beveridge.

Both Leiu and Lewis were trialled through the Blues' defensive structure in recent weeks, while Cripps - the younger brother of Carlton captain Patrick - was utilised as a forward target.

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Leiu's chances were hampered after suffering a foot injury that has since left him in a moon boot, with the Eastern Ranges product set to join Lewis in remaining at Princes Park as part of Carlton's VFL system.

Cripps is set to return to his WAFL side East Fremantle for the 2022 season.

The SSP window is set to close next Wednesday, March 9 - with several other sides still mulling over their list options ahead of the deadline.

Essendon (Tex Wanganeen and Nick Martin), St Kilda (Jack Hayes), Gold Coast (James Tsitas), West Coast (Hugh Dixon) and Sydney (Paddy McCartin) have signed players through the SSP.

For sides that decide not to allocate list spots for 2022, they will be able to use them for the Mid-Season Rookie Draft on June 1.