ITV Wales understands that former MPs Neil Hamilton and Mark Reckless have been picked to head two regional lists for UKIP ahead of May's election.
Former Tatton MP Neil Hamilton will contest the Mid and West Wales list while Reckless is set to top the South Wales East list.
Ukip's Welsh leader Nathan Gill is expected to set out the case for Wales to leave the European Union at the party's spring conference in Llandudno.
He's expected to call for the devolution of fishing to the Welsh Assembly if the UK exits the EU and if there's a leave vote Mr Gill says it would help protect farmers and put power back into the hands of the people.
A recent ITV Wales / Cardiff University opinion poll put the leave camp on course for victory in Wales at June's referendum.
Mr Gill is expected to call on activists to give every last ounce of effort insisting there's only 16 weeks left to change the course of history for good.
UKIP's top regional candidate in South Wales Central, Gareth Bennett says he'd resist any de-selection attempt after "surprise" selection.
Nigel Farage has said he hopes the party would "do very well and make a breakthrough" at the elections to the National Assembly for Wales.