Mooy is now owned by Manchester City but has had no shortage of reported suitors after playing an integral role on loan in the Terriers' promotion.
Mooy is set to join Huddersfield in a £10million deal.
It would smash their previous transfer record set 12 months ago when they paid 1860 Munich $3 million for defender Christopher Schindler.
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The Australian worldwide penned a three-deal at Pep Guardiola's outfit before being sent out on loan to the John Smith's Stadium just a over a fortnight later.
There were suggestions that Mooy might be given a chance to prove himself in Manchester in 2017-18, but, after assessing the player, Pep Guardiola decided he wanted to look elsewhere for midfield reinforcements, albeit with the buy-back option.
Town will now press ahead with other key transfer business, with the club targeting several new recruits.