Ukip will announce its final list of leadership candidates hoping to replace Nigel Farage on Wednesday.
It comes after the favourite to become leader Steven Woolfe missed the deadline to submit his nomination application on Sunday and admitted failing to declare a criminal conviction.
His bid to takeover the party is now in the hands of officials, who met on Tuesday to discuss the eligibility of all candidates.
The National Executive Committee-led panel will carry out a final check on the candidates before announcing the list on Wednesday.
A Ukip spokesman said: "An NEC led panel has today met to determine the eligibility of those candidates that submitted their nomination papers to stand for party leader.
"That panel has now met and with one final round of checking to go, the party aims to announce the full list of candidates at midday tomorrow, Wednesday, August 3."
Mr Woolfe insisted he is still in the race after overshooting the deadline of noon on Sunday by 17 minutes, and has left the door open for a legal challenge if party officials block him from standing.
It also emerged that Mr Woolfe failed to declare a drink-driving conviction when he stood for a police and crime commissioner post in 2012.
The MEP said he "forgot about the conviction" when he stood in the Greater Manchester PCC election in 2012, in a possible breach of electoral law.
He has also denied allegations that he allowed his membership to lapse in 2014, which raised issues about his eligibility under controversial new party rules.
Former deputy chairwoman Suzanne Evans, who was suspended from the party earlier this year after repeated clashes with Mr Farage, said Mr Woolfe is "probably ineligible".
Mr Farage, who announced he was quitting after the Leave victory in the EU referendum, said Ukip members should vote for the candidate who will best represent the party "on the big media stages" and around the country.
He urged his successor to "bypass" Ukip's national executive committee (NEC), claiming the governing body contains "total amateurs" who have acted as a "barrier to radical change and modernisation".
Mr Woolfe is standing alongside Huntingdonshire councillor Lisa Duffy and MEPs Bill Etheridge and Jonathan Arnott.
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