Both teams came through tense derby matches in the conference semifinals to progress to this point.
Manager Steve Cherundolo said that center-back Eddie Segura is the Black and Gold's only injury concern with the Colombian being labeled as a "question mark" with an undisclosed ailment.
Gareth Bale figures to be involved in this one despite not getting major minutes since joining LAFC.
Defender Freddy Kleemann remains sidelined with a right knee injury while fellow defender Zan Kolmanic is out with a left knee issue.
The Verde and Black have no new injury concerns ahead of the biggest match in franchise history.
LAFC: Crépeau; Palacios, Chiellini, Murrillo, Hollingshead; Acosta, Sánchez, Blessing; Bouanga, Arango, Vela
Austin FC: Stuver; Gallagher, Gabrielsen, Cascante, Lima; Ring, Valencia; Fagúndez, Driussi, Finlay; Urruti
Ones to watch
Cristian Arango (LAFC)
He showed why he's an MVP candidate as he scored the goal that the Black and Gold to this match moments after the Galaxy had tied things at 2-2 and has a goal against Austin this season.
Sebastian Driussi (Austin FC)
The MVP favorite has been at his very best in the Verde and Black's first playoff campaign, scoring twice against Real Salt Lake and again in the penalty shootout. He added another against Dallas and has two points against LAFC this season.
Austin won both matches against LAFC this season with the Verde and Black scoring six goals in the two games.
Carlos Vela ensured a nervy finish, scoring from the penalty spot on 86 minutes, but the Verde and Black held on through eight minutes of stoppage time to go top of the West.
The rematch occurred on August 26th and Austin scored their most impressive win in club history, battering LAFC 4-1 in Bale's first start for the Californians.
Fagundez scored for the second time against the Black and Gold with a free-kick in the 32nd minute to open the scoring.
Maxi Urruti doubled the lead two minutes into the second half, heading past Maxime Crepeau and he scored Austin's third minutes four minutes later.
Driussi made it 4-0 in the 59th minute and despite Arango grabbing a consolation goal, the Verde and Black stamped themselves as a title contender with a thumping victory.
The match will be televised nationally on ABC with ESPN3 providing streaming coverage in Spanish.
Kickoff is set for 3pm Eastern time.