The Take That singer was performing in East London when he reportedly said to his fans: "I'm serious. What are we going to do about Rylan?
"I might have to be honest on Saturday night and go, 'Rylan, I thought that was absolute s**te'."
We take a look back at other famous X Factor feuds involving judges and contestants - from Tulisa Contostavlos and Kelly Rowland's Misha B falling-out, to Cher Lloyd's Cheryl Cole singing jibe.
Photo gallery - X Factor's famous feuds:
Tulisa Contostavlos and Kelly Rowland fell out on The X Factor when Tulisa accused Rowland's act Misha B of bullying other contestants. Rowland claimed Tulisa was "completely out of line" with her comments, which she made live on the ITV1 show.
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