Gregg Allman is to undergo diagnostic cardiac testing at a clinic in Jacksonsville, Florida to ascertain whether he needs additional care after a recent hernia operation, reports Rolling Stone.

The tests will mean Allman must delay his forthcoming American publicity tour for his memoir, My Cross To Bear.

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“I’ve been working on the book for years and am grateful for all the support I’ve received in putting it together,” said Allman in a statement. “As soon as doctors give me the thumbs up to go back on the road, I will be heading out onto my book tour and I can’t wait to meet all of my fans.”

Allman was also scheduled to appear on several American TV shows to promote the book, including Piers Morgan Tonight.