Stephen Flynn and Alison Thewliss are set to battle it out to become the next leader of the SNP at Westminster replacing Ian Blackford.
The MP for Ross, Skye and Lochaber announced last week that he did not intend to stand again when the SNP's AGM takes place on Tuesday evening.
Thewliss, who announced her intention to stand on Saturday following a number of days of deliberation, revealed Stuart McDonald would run to be her deputy following the resignation of Kirsten Oswald.