Hajime Moriyasu has already led Japan to qualification for next year's World Cup finals but there was no disguising his frustration at his understrength side losing 1-0 to Australia in Perth on Thursday.
Aziz Behich's 90th-minute strike consigned Samurai Blue to a first loss to Australia in 16 years and a first defeat in all matches since February last year.
"It ended up being an extremely frustrating and disappointing result," Moriyasu told reporters.
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