West Coast bosses are understood to be seeking clarification from the AFL on how Rioli needs to be paid under drug offences.
Rioli is tipped to be retained on the West Coast playing list for next season with his future beyond 2020 clouded with such uncertainty on eventual length of his ban.
Kelly, 25, is expected to finally publicly declare his future intentions after Geelong fairest-and-best presentation in Melbourne on Thursday.
His announcement is tipped for Friday, ahead of officially revealing all plans during AFL trade period starting next Monday.
The classy moving clearances specialist has made 48 appearances with the Cats since he was finally a mature-age draft selection at the end of 2017.
He has averaged an impressive 24 disposals an outing and finished his silky midfield duties with 48 goals.
West Coast and Cats officials are understood to have already commenced negotiations on a trade deal.
Fremantle football manager Peter Bell has declared intentions to make a desperate last-minute bid to lure the big possession-winning star with a tempting offer of a highly appealing single-figure 2019 draft pick.
“By no means are we giving up on a race for Tim Kelly,” Bell told AFL Trade Radio.
Fremantle already sit at number seven in next month’s national draft and also likely to get pick six in a trade expected for gifted winger Brad Hill to St Kilda.
West Coast and Geelong are understood to have started talking on the Eagles first selection at 14 as well as a first round pick next year.
Emerging young all-rounder Jarrod Brander could also emerge as part of any swap for Kelly to return to his home state.
Kelly, 25, has made clear his needs to move back to his home state for purely personal reasons with his partner and young family after two stunning seasons at Geelong.