Amelia Lily, 2 Shoes, Jonjo Kerr or James Michael, who were each sent home by their own mentors after just one performance, will face a phone vote to decide who will re-enter the competition.
'The four acts have never been in a public vote so, with Frankie leaving the competition, this is an opportunity for the public to decide who comes back to the show,' confirms an X Factor spokesman.
Gary Barlow's boy Frankie, 18, was booted out of the programme for breaking its rules after he allegedly boasted about taking cocaine backstage.
'I'd like to apologise to Gary, my fellow contestants and everyone who has voted for me, but, as of today, I will no longer be in The X Factor,' Frankie announced in a statement.
'My life during the show has gone out of control and my behaviour off stage over-stepped the rules of the competition.
'I no longer deserve my place in the show, so I'm leaving. I would like to thank everyone who's supported me.'
To vote for your favourite act to return call one of these numbers:
2 Shoes 0901 616 1301
Amelia Lily 0901 616 1302
James Michael 0901 616 1303
Jonjo Kerr 0901 616 1304
Voting costs 36p max from BT landlines. Calls from other networks may be higher and from mobiles will be considerably more. At least 22p per vote goes to Help for Heroes. Terms at itv.com/terms. Voting closes as announced in Saturday night's show. Votes cast after the closing time will not be counted but may still be charged.
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