There are many aspirants within the AAP for the three seats that go to polls in mid-January but the party is looking for faces outside the organisation.
The delay in the announcement of names would avoid acrimony over the candidatures.
Senior party leader Kumar Vishwas, who has been at odds with the leadership for sometime now, was considered one of the strongest contenders.
However, given his present equation with Chief Minister Arvind Kejriwal, the chances of the party sending him to the Upper House are slim.
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The party had in October approached former RBI Governor Raghuram Rajan, but he declined the offer.
The move of not fielding any party leader for the Rajya Sabha is also seen as an attempt to put an end to the intra- party rivalry.
Delhi sends three members to the Rajya Sabha. Currently, the city-state is represented by Janardan Dwivedi, Parvez Hashmi, Karan Singh, whose terms end in January.
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