The 61-year-old Sydneysider, who guided his national team to the last-16 of the global showpiece in 2022, was named as the Iraqis' head coach on Friday and will be thrown straight in to rescue their ailing World Cup quest.
Arnold, who left the Australia job in September after six years in charge, has a tough job to get Iraq to the 2026 competition in North America with the team lying third in group B of Asian qualifying.
They face two huge games against leaders South Korea in Basra on June 5 and second-placed Jordan in Amman five days later.
If they win both matches, Iraq would earn qualification for the World Cup for the first time since their debut in 1986 but it's a tall order with Arnold's Spanish predecessor Jesus Casas having been sacked halfway through his four-year contract in March after a calamitous 2-1 loss to Palestine.
It will be Arnold's first job in soccer since he steered the Socceroos through the group stages in Qatar, only to lose a close one with eventual champions Argentina in the last 16.
But he left the job after Australia made a disappointing start to the third round of qualifiers for the 2026 finals.
Now he has a second chance to get to the big show with a third or fourth-place group-stage finish still offering Arnold the chance to take Iraq through via the fourth stage of Asian qualifying.
Recently, Arnold has been helping mentor South Sydney's kickers, including Latrell Mitchell, in the NRL.
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