Minogue was in negotiations to reprise her role on the show after last year's panellist Kelly Rowland ruled herself out.
The Australian entertained the idea of a return despite disclosures that she and show boss Simon Cowell had an affair. But discussions have now foundered.
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Talks to try to resolve one of the rail disputes at Govia Thameslink Railway will be held at ACAS tomorrow.
Officers are currently at the scene as investigations into the exact circumstances of the man’s death get underway.
Man jailed after being caught with cannabis worth millions