A representative of Nieve reportedly told Spanish newspaper Diario de Navarra that he would be heading to the Australian team for the 2018 and 2019 seasons.
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The climber has been pivotal in helping Chris Froome through the mountain stages of the Tour de France this year alongside fellow Basque Mikel Landa who is also reported to be leaving for pastures new.
Nieve joined Team Sky from former Basque outfit Euskaltel-Euskadi back in 2014 for his climbing prowess and he repaid Sky boss Dave Brailsford by winning a stage and the mountains classification at the Giro d’Italia in 2016.
Orica-Scott will continue their transition from one-day team to a GC orientated squad as they look to bolster support for the Yates brothers and Esteban Chaves.
Landa, who aimed for Giro overall victory in May before a crash scuppered his chances, is said to be leaving Team Sky for Spanish team Movistar.
One of Froome’s major lieutenants in this year’s Tour de France, Landa has shown he could potentially lead a WorldTour team and with Alejandro Valverde not getting any younger Eusebio Unzue is reported to want Landa to fill that gap.