Six Shiv Sena (UBT) parliamentarians are likely to meet Lok Sabha Speaker Om Birla in Delhi to submit a letter for the formation of a separate group.
Party's parliamentary party chief Arvind Sawant has issued a whip asking all nine Lok Sabha and one Rajya Sabha members to attend a meeting on Thursday.
The lawmakers, who are at an undisclosed location in Delhi, are expected to merge with the Shinde-led Shiv Sena faction.
Shiv Sena (UBT) is on the verge of a split, days after 20 Trinamool Congress (TMC) parliamentarians defected and allied with the BJP-led National Democratic Alliance (NDA).
The developments come as the NDA government is keen on passing the delimitation bill, which requires a two-thirds majority in the Lok Sabha.
