Graham Arnold's Sky Blues sit behind Victory, who are three points clear at the top, ahead of a trip to Wellington.
The Phoenix are a point behind Sydney, who will seal a top-two spot and a home semi-final should they avoid defeat.
Arnold's side are unbeaten in 13 away games this campaign, and they have won back-to-back games ahead of their trip to Westpac Stadium.
Austria captain Marc Janko is on track to win the golden boot, having scored 16 goals for Sydney – three more than Phoenix attacker Nathan Burns.
Wellington have been in scratchy form, with Ernie Merrick's side coming from behind to edge the Mariners 3-2 last time out.
If Josep Gombau's men win and the Phoenix lose, the Reds will jump into third and host the Brisbane Roar in the first week of the finals.
Victory complete the round when they host the Mariners, and Kevin Muscat's men are set to win their first piece of silverware since 2009.
