A former Black Cats has begun chemotherapy as he battles cancer.
His former Hibs teammate Tam McManus tweeted that Miller had been receiving treatment in the USA, where he last played, but will be returning home today to begin chemotherapy.
"We heard about the news recently but we didn't know how bad it was".
He finished his career with Wilmington Hammerheads in America after a three year spell in Australia.
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Charlie Adam tweeted: "Thoughts are with Liam miller and his family at this tough time.#staystrong".
Ireland captain David Meyler also gave his support to Miller saying: "Obviously, we heard the news although we are unsure of all the details". His parents live in the family home in Ovens.
"He played with us and with soccer clubs in the area".
The midfielder joined Manchester United, where he scored two goals in 22 games in two years across all competitions. He also played at worldwide level from U19 up, earning 20 senior caps with the Republic of Ireland between 2004 and 2009.
Fellow professionals both current and former expressed their well wishes to the midfielder on Twitter.
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John Hartson, who himself was diagnosed with testicular cancer, also wished Liam the best with his treatment.
A number of former Ireland internationals have expressed their sorrow at news of his illness.
"The thoughts of everyone at Manchester United go out to Liam Miller and is loved ones at this hard time" a tweet from United read. "Will say a prayer for him tonight".
This story originally appeared in the Evening Echo.
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