Susan Boyle in doubt for Britain's Got Talent live in Birmingham
Since then there have been various reports saying Boyle has not been showing up for rehearsals.
The tour has been billed as containing winning act Diversity plus all the nine other finalists - Julian Smith, Shaheen Jafargholi, Aidan Davis, Stavros Flatley, Hollie Steel, Shaun Smith, Flawless, 2 Grand and Boyle.
Diversity, a 10-piece street dance troupe from Essex, consisting of three groups of brothers and their friends aged from 12 to 25 years old, stormed the final last month with their routine of slick street dance moves.
Troupe leader Ashley Banjo, 20, was praised by the judges for his innovative choreography.
The arena tour, which will travel across the UK until the end of June, will be hosted for the second year running by ITV2's Britain's Got More Talent presenter Stephen Mulhern.
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