The brother of an Iranian asylum seeker who was allegedly raped on Nauru has made a heartfelt plea to the government to reunite the woman, now in Australia, with her family.

The asylum seeker, Nazanin, was allegedly attacked in May on her way back to the Nauru detention centre after a visit to the island to meet friends. She was flown to Australia in August for treatment.

"It wouldn't happen to a woman in Australia, regardless of what her nationality was, it beggars belief. It's an appalling way to treat someone." Credit:Getty Images

The man, who doesn't want to be named, said his sister was bleeding in the stomach and was likely to undergo surgery on Monday.

"Emotionally she has completely deteriorated. She needs her family," he said.