According to AFL.com’s Mitch Cleary, Marsh is in line to join the Blues in hope of an AFL lifeline after being one of nine players cut from the Saints this off-season.
Carlton passed on an available rookie selection this week and will have the option to add to their list for 2021 via the Pre-Season Supplemental Selection Period.
The SSP will begin on January 6, with uncontracted players able to join squads from that date until March 9.
North Melbourne, Essendon, Sydney and Port Adelaide join the Blues in having one selection available for next year, while Melbourne, Richmond and Collingwood have two remaining spots and the Saints have three.
Adelaide are likely to move on Bryce Gibbs to the inactive list for administrative reasons after selecting him in the Rookie Draft, which would give them one spot to add to their squad.
Clubs are available to hold off on selecting players via the SSP and could look towards the Mid-Season Rookie Draft instead.