Stoinis posted scores of 9 and 32 in the Warriors’ opening Shield win against Tasmania but missed the side’s loss to New South Wales last round due to personal reasons.
The 28-year-old has two T20I and eight ODI matches to his name and showed his class with an impressive 146* against New Zealand in Auckland in January.
Youngster Will Bosisto and paceman Andrew Tye, who are yet to play for WA this Shield season, have also been included in the 14-man squad.
Left-arm spinner D’Arcy Short is the only confirmed omission at this stage.
In-form keeper/batsman Cameron Bancroft carried his bat in WA’s first innings against NSW with a 76* and backed it up with an 86 from 168 balls in the second innings.
Ashes hopeful Hilton Cartwright will be eying a big total after failing to trouble the scorers in both innings against the Blues.
Hard-hitting WA batsman Jonathan Wells will line up against several of his new Adelaide Strikers teammates after signing with the Strikers in August.
South Australia named an unchanged squad leading into Monday’s clash.
Both squads will be finalised before the toss at the WACA.
Mitch Marsh (c), Ashton Turner (vc), Cameron Bancroft, Jason Behrendorff, Will Bosisto, Hilton Cartwright, Andrew Holder, Simon Mackin, Shaun Marsh, David Moody, Jhye Richardson, Marcus Stoinis, Andrew Tye, Jonathan Wells.