"Ryan is a solution, there could be a couple of different things in the way we approach things," he told reporters.
"Holland represents a different problem to Chile, so we'll have a look in the next couple of days."
Australia were largely encouraged by their battling performance against Chile but the Dutch will present a much greater challenge judging by their performance in the 5-1 win over world champions Spain in the Group B opener.
With his defence preparing to face a Dutch attack that ran rampant in Salvador, Postecoglou may end up regretting his last-minute decision to leave Luke Wilkshire, who has won 80 caps for his country at right back, out of his final 23-man squad.
McGowan has some experience of the role from his days at Hearts in Scotland but was given a torrid time by Brazil's Neymar when he lined up on the right side of the defence in Australia's 6-0 humbling in Brasilia last year.
Franjic, 26, admitted he was shattered after scans confirmed he had torn his left hamstring.
"Shattered to get the bad news that ends my @fifaworldcup but I would not change anything for the world," he said on Instagram.
"Everything happens for a reason in life and this will only make me stronger. I will be standing by the boys all the way and still believe we can progress from the group stage."
(Reporting by Nick Mulvenney in Natal, editing by Justin Palmer)
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