The BBC dropped the dance-off in 2010 for series 8 of the dancing competition, but producers have decided to revive the feature for this year's results show.
The two celebrities with the lowest scores will be forced perform their routine again before the judges decide who to send home.
"In the past viewers have had sympathy for someone and voted to keep them in and a better dancer has ended up leaving the contest," Ball told the Daily Star.
"Having the dance-off may be cruel but it is fairer. Heartbreak will come for everyone in the contest at some time - apart from the champ."
The Strictly Come Dancing live shows begin on October 5 on BBC One.
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