In other notable round 23 selection news, Brisbane lost Tom Doedee for their clash with Fremantle, Collingwood dropped Tom Mitchell and Will Hoskin-Elliott, while the Cats are set to welcome back Patrick Dangerfield and Jack Martin.
Hogan will miss a second straight game with a lingering foot injury, and his absence has been compounded by Stringer's hamstring strain.
The Giants (14-7) are clinging to eighth spot, and face a tough task to topple in-form Gold Coast (14-6) without their two strike weapons on Saturday.
"We'll continue to manage him (Hogan) and cross our fingers and hope that he's right for St Kilda," GWS coach Adam Kingsley said.
"He's not going to do any more damage to it. We know that for sure.
"He just needs to manage the pain, and right at this moment there's just a fraction too much for him to be able to manage it."
GWS have recalled winger Jacob Wehr, while the Suns have brought back Sam Flanders and Alex Sexton to replace injured duo Bailey Humphrey (knee) and Malcolm Rosas Jr (hamstring).
Adelaide's all-time leading goalkicker Walker returns for Saturday night's blockbuster clash with Collingwood after being rested from the trip to Perth last week.
Crows midfielder Harry Schoenberg has been named for his first AFL appearance of the season, while veteran Brodie Smith returns.
But Luke Pedlar, who kicked three goals against the Eagles, is out after injuring his hamstring at training on Wednesday.
Collingwood dropped Mitchell and Hoskin-Elliott on top of losing Jeremy Howe to concussion, with Bobby Hill (illness) still not ready to return.
Star Blues midfielder Walsh has been sidelined by a foot injury since round 13, but has been cleared to return for Saturday's encounter with Port Adelaide, who have lost luckless forward Jack Lukosius to a calf injury.
Brisbane welcome back premiership defenders Ryan Lester and Brandon Starcevich for their Friday night battle with Fremantle, but Doedee has been ruled out with knee soreness.
The Dockers welcome back tagger Corey Wagner from a heel injury.Â
Dangerfield is back for Geelong's crunch clash with Sydney at the SCG on Sunday, with the Swans losing star ruckman Brodie Grundy (concussion) and Justin McInerney (knee).
The Saints have handed a debut to 203cm ruckman Alex Dodson for Friday night's clash with Essendon, but Hunter Clark is out with a knee injury, while Liam Henry and Max Heath were dropped.
Essendon lost Zach Merrett (hand), Archie May (ankle) and Dylan Shiel (suspension), but get back Kyle Langford and will unleash their 15th debutant of the season in Rhys Unwin.
Melbourne get back star defender Steven May from suspension for their meeting with an unchanged Hawthorn on Saturday.
