A second term for incumbent Ansari appears certain with several parties in the alliance and outside giving their support to his candidature in the August 7 election.
Key UPA constituent Trinamool Congress, however, may propose the name of former West Bengal Governor Gopalkrishna Gandhi as Mamata Banerjee is not quite enthusiastic about Ansari's candidature for second term.
The last day for filing nomination for Vice Presidential election is July 20, a day after the Presidential poll.
The UPA is comfortably placed in the electoral college comprising 790 MPs. With the backing of outside supporters like Samajwadi Party and Bahujan Samaj Party and others, the UPA has nearly 500 MPs on its side.
Prime Minister Manmohan Singh, who has stepped up efforts to seek a consensus on Ansari's candidature by talking to leaders of non-UPA parties like JD(S), CPI(M) and CPI, spoke to Trinamool chief and West Bengal Chief Minister Mamata Banerjee on Wednesday seeking support for Ansari.
The Prime Minister is learnt to have informally solicited the support of JD-U, on Vice-Presidential election amid indications that the NDA ally might find it difficult to oppose Ansari's candidature having earlier described him a "good" candidate for Presidentship. JD-U is supporting UPA Presidential candidate Pranab Mukherjee.
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JD-U chief Sharad Yadav, however, remained non-committal on the issue saying his party will take a decision after deliberations in the NDA and talking to other opposition parties.
Banerjee, who has been keeping away from Delhi after Congress rejected her choice of Presidential candidates and is yet to declare her party's support to Mukherjee, has deputed Railway Minister Mukul Roy for the meeting. (More) SPG AMR RAI