Marshall, who turns 31 next month, informed St Kilda last week that he would not attend the Trevor Barker Award function at Crown's Palladium, saying he did not feel valued by the club and did not feel it was appropriate to attend while his trade request remained unresolved.
St Kilda are seeking Geelong's first-round pick (No.14) and a player in exchange for the contracted ruckman. The Saints initially asked about small defender Lawson Humphries but have since shelved that inquiry. From Geelong's perspective, sources describe the price as high for a ruckman of Marshall's age, though the Saints argue the demand is fair because Marshall is contracted until the end of next year.
Geelong also hold picks 34, 55 and 73 in this year's draft, as well as a full set of selections in 2027 and 2028. The Cats also need draft capital to secure Essendon defender Jordan Ridley, for whom the Bombers will seek significant compensation.
Marshall finished 10th in St Kilda's best and fairest count.