Former teammates including Charlie Adam, Noel Hunt and Chris Sutton have tweeted their support for Irishman Miller and his family.
"Was in the U.S. for treatment this month and flies back tomorrow to start chemo here".
"I gave him his debut and he played wonderfully well in a Champions League game one evening, he was absolutely outstanding", O'Neill told reporters at today's press conference.
"I heard recently but I didn't know how bad it was".
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"He starts chemo tomorrow and is fighting hard really can't go into any more detail than that out of respect for him and family", said McManus.
Miller played for three clubs down under - Perth Glory, Brisbane Roar and Melbourne City - before returning to his native Cork City.
My thoughts are with Liam miller and his family this morning.
"There is a lot of shock in the community", he said.
"He played with us and with soccer clubs in the area".
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He had 21 caps with Ireland scoring once in a friendly against Sweden.
Fellow professionals both current and former expressed their well wishes to the midfielder on Twitter.
His former Hibs team-mate McManus also claimed that he is undergoing chemotherapy. "Will say a prayer for him tonight".
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