The two accused have been identified as Kishan alias Mohit, a friend of the victim, and his associate Vipin. While the third accused, identified as Devender -- who is Mohit's brother, was still at large, senior police official said.
According to police, during interrogation, they said that Mohit had befriended the girl by talking to her regularly over phone.
On November 21, Mohit and Vipin waylaid the girl while she had gone to purchase milk from a shop near her Uttam Nagar residence and convinced her to come inside their car, they said.
When she did not return home, her relatives registered a missing complaint and soon a case of abduction was registered.
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The duo allegedly took her to Greater Noida and confined her in a room, where they allegedly raped her for about 14 days. Later, Devender joined them too, police said.
The girl was rescued on December 6 and rushed to a hospital at Gautam Budh Nagar before being shifted to a Delhi hospital.
All three accused are residents of Greater Noida and Ghaziabad and have criminal cases registered against them, police said, adding efforts were on to nab Devender.
The girl was, earlier, said to be 16-year-old but after verifying her records, she turned out to be 14, police added.