The Aussie lock was banned for eight months after admitting taking cocaine at Bath's end- of-season party in London.
And in an interview in this morning's Sydney Sunday Telegraph Harrison, 35, admits: "I want to re-establish my reputation after a horrible mistake.
"I admitted I was in the wrong and only had myself to blame. I had to repair whatever damage I'd done to my family, people close to me and rugby, which has given me a fantastic career.
"It'd be wrong of me to sever all ties and I hope rugby doesn't want to sever ties with me.
"I've been sentenced and punished. People have gone through a lot of pain and I'll carry that for a long while."
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