Two of the Australians who fell gravely ill after drinking pina coladas at a Fiji resort have returned home. 

Seven Australians staying at the high-end Warwick Resort have been hospitalised. 

Tanya Sandhoe and her teen daughter Georgia landed in Sydney last night after getting medical clearance to fly. 

Australia Correspondent Donna Demaio told Andrew Dickens it's a suspected mass alcohol poisoning. 

She says investigations are continuing into what happened, with toxicology reports expected soon. 

New Zealand's travel advice to Fiji's been updated, warning of a potential drink spiking and methanol poisoning. 

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