Keith Urban has slipped a disc in his back. The country singer revealed his condition to fans at a concert at the Konocti Harbor Resort and Spa in Kelseyville, California, on Saturday but still managed to perform as normal.

Keith's publicist Paul Freundlich didn't divulge what caused the singer's injury, but has reassured fans it will not affect his touring schedule.

The musician is currently completing a series of North American tour dates, but is taking regular trips to Australia to visit his wife Nicole Kidman and their daughter Sunday Rose who was born in July.

Last month, Keith revealed a tattoo on his bicep in his wife's honor while performing in Tennessee.

Keith has previously admitted he prefers it when Nicole stays at home while he is on tour, because it puts less pressure on their relationship.

He added: "I love having her with me when I tour, but at the same time, it's work. You don't want to ask too much of your family."

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