The former X Factor winner did not specifically confirm or deny the speculation in a handwritten note posted to Twitter, but he did tell followers he's getting himself better for the New Year.
Matt wrote: "I want to thank my fans for all your lovely messages of support. I'm getting myself better… I want to be ready to give it 110% on tour next year."
"I love you all," he concluded, "and will see you on the other side. Happy New Year!"
Among those who have tweeted messages of support to Matt is One Direction's Harry Styles, who said: "See you soon brother .x."
Matt Cardle (@matt_cardle_uk) December 31, 2013
Matt won the seventh series of X Factor, while One Direction finished in third place.
Since then, he has released three albums - Letters, The Fire and, most recently, Porcelain - and joined forces with former Spice Girl Mel C for a duet, 'Loving You', earlier this year.