The Eagles believe they will set up their 2014 coaching department within the next two weeks after they appointed Simpson to the senior job earlier this month.
They have also recently secured Brady Rawlings as an assistant coach and Jaymie Graham as a development coach while Scott Burns has moved on to Collingwood.
Football operations manager Craig Vozzo said the finalisation of the department was imminent and Voss and Harvey were "certainly part of the discussion".
"I reckon it's about a week or so away," Vozzo told 6PR on Tuesday night.
"We're a fair way down the track through that process but there's still a few balls to fall so I reckon about a week, possibly two."
Dual Norwood premiership coach Nathan Bassett is also in the Eagles' calculations, although the former Adelaide defender has been linked to Essendon.
Vozzo acknowledged the Eagles' current coaching panel was young but said AFL experience wasn't a necessity when it came to appointments.
"Talking to Adam about this a while back, I think [Alastair] Clarkson started at Hawthorn at about a similar age with a pretty young team around him; I think [Damien] Hardwick and Ross Smith and one other," he said.
"If we end up going that way, that doesn't scare us either.
MATCH REVIEW: Crows gun learns fate for dangerous tackle
The Match Review findings for Friday night's round six game are in
Pies find their mojo to power past Port
Collingwood has overcome a sluggish start to defeat Port Adelaide by 42 points
AFL concedes umpiring error made in Draper non-call
While saying it was the correct approach at the time, the AFL has admitted an umpiring error was made in not penalising Sam Draper for holding the ball on Friday night
Stream your team: Watch VFL, VFLW, SANFL and WAFL games LIVE and FREE
You can watch every game of the 2024 VFL, VFLW, SANFL and WAFL seasons LIVE on AFL.com.au and the AFL Live Official App