The Cork native, now 36, is reportedly flying back to Ireland on Monday, where he will begin chemotherapy after undergoing initial treatment in the US.
"Was in the United States of America for treatment this month and flys back tomorrow to start chemo here". He's still fighting it. All thoughts go out to him and his family.
McManus also clarified various media reports. Praying he can get better'.
He tweeted: "Awful news about Liam Miller keep the fingers crossed that he somehow pulls through".
Ex-England striker Chris Sutton said: "All thoughts and prayers go out to my old teammate Liam Miller tonight".
There has been an outpouring of support following the devastating news, with a number of Miller's friends and former teammates, including Ian Harte, John Hartson and Darren O'Dea, offered their support to the talented midfielder during his cancer battle.
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My thoughts are with Liam miller and his family this morning. "We're thinking about him and we hope he can pull through".
Fellow Ireland global Ian Harte said: "Very sad news about one of my old teammates Liam Miller, thinking of him and his family at this very hard time".
While Stoke playmaker Charlie Adam added: "Thoughts are with Liam Miller and his family at this tough time.#staystrong".
Miller has been playing in U.S. up until 2016 when he announced his retirement from football.