Maclaren, who was named in Australia's 32-man preliminary squad for the tournament last week, nabbed three opportunistic goals for his Scottish team in Sunday's match - including a stoppage-time equaliser.
Despite scoring six league goals in his last eight matches, the 24-year-old will be overlooked by Australia's Dutch coach Bert Van Marwijk, according to reports from Fox Sports and The World Game.
It's understood Maclaren was told of his non-selection prior to his stunning three-goal performance for Hibernian - the team he joined in January on loan from 2. Bundesliga club Darmstadt.
Tomi Juric and Tim Cahill are expected to be two of the attackers picked in Van Marwijk's squad that can lead the front-line.
Cahill has only played 157 minutes this season for Melbourne City and Engish championship side Millwall since the A-League season commenced in October - with his last goals coming in the form of a brace for the Socceroos against Syria in the World Cup playoff that same month.
While Juric has scored seven goals in his 27 league appearances for Swiss side FC Luzern, he has only found the back of the net twice this year and hasn't played for his club since April 22 because of an ankle injury.
Van Marwijk is set to chop the Socceroos squad to 26 on Tuesday, which will consist of the players attending the pre-tournament training camp in Turkey, before settling on a final 23-man list in early June.
Australia are set to play Czech Republic (June 1) and Hungary (June 9) in pre-World Cup friendlies before embarking on their Russian campaign in group C - with matches against France, Denmark and Peru.