Port Adelaide officials are expected to move quickly to appoint a caretaker coach, possibly Shaun Rehn, following Sunday's dramatic departure of Matthew Primus.
Primus was close to tears on Saturday at Sydney Showgrounds after Greater Western Sydney (2-16) climbed off the bottom of the ladder with their shock win 16.11 (107) to Port's 10.13 (73).
Port officials said on Sunday night they weren't going to comment on speculation, amid reports of crisis talks at the 14th-placed club.
It's unclear whether former skipper Primus, who has coached the Power to 13 wins from 47 games, has walked out or been sacked.
"I know as much as you do ... I can't get onto him (Primus) either," Port assistant coach Rehn told the AFL's website on Sunday.
Primus had said on Saturday he wanted to stay on, after describing the defeat as the club's worst loss since entering the AFL in 1997.
"I feel gutted and pretty emotional about it all right now, but I believe in the group (and want to keep coaching them)," he said.
Sydney are a game clear of Adelaide on top of the ladder following their 14.9 (93) to 10.11 (71) win over Carlton at Etihad Stadium on Sunday, although veteran onballer Jude Bolton suffered a knee injury yet to be fully assessed.
The Swans host third-placed Collingwood on Saturday night.
Collingwood claimed a controversial 12.19 (91) to 13.7 (85) win over St Kilda at the MCG on Saturday night. Fans of the 10th-placed Saints were outraged after Collingwood's Harry O'Brien received a dubious free kick deep in defence with seconds to play.
Adelaide held on to beat Essendon 16.8 (104) to 15.10 (100) in a gripping finish on Sunday night, as the Bombers dropped one spot to eighth after almost pulling off a terrific win at AAMI Stadium.
Fremantle skipper Matthew Pavlich grabbed the lead in Coleman Medal with 55 goals after a bag of eight in his side's derby triumph over West Coast 17.11 (113) to 6.12 (48) on Saturday.
The win leaves the Dockers (11-7) in ninth spot, trailing Essendon by less than one per cent, while West Coast remain fifth.
North steamrolled Western Bulldogs in the second half of their Etihad Stadium clash on Saturday to win 18.7 (115) to 8.13 (61).
After Richmond had lost three games in a row by a kick, classy midfielder Brett Deledio led the 12th-placed Tigers to a 20.12 (132) to 12.12 (84) victory over Brisbane at the Gabba on Saturday night.
Melbourne scored their third victory for the season on Sunday with a 16.12 (108) to 9.12 (66) win over bottom side Gold Coast at the MCG. Teenager Harley Bennell contributed 38 possessions and four goals in a losing side.
Geelong extended their winning streak against Hawthorn to nine with a 18.10 (118) to 17.14 (116) victory in a thriller at the MCG on Friday.
Tom Hawkins was the hero for the Cats, kicking a goal after the siren from 55 metres out. It was Hawthorn's first loss in nine games, dropping them from second to fourth.