Hansen was taken into hospital last week and remains seriously unwell.
He has received a number of messages of support since with many in the footballing world sending their own tributes.
In 14 years at Anfield, the 69-year-old won every major honour available to him.
Souness provided an emotional tribute to talkSPORT. He said: "He's not a colleague, he's a good friend. When people become ill, people always talk about how much of a great guy there that person was.
"I'm telling you now, he's a real human being. It's hard to find a bad word about him. He's a rascal when it comes to humour, he was very smart with that.
"I, like every person who comes across him or listened to him on the television, say a little prayer for him. He is one of life's good guys. Please god, we're all saying a prayer for him that he gets through this.
"I spoke to his wife, Janet, a couple of days ago and you can imagine what state she's in. I'm telling you, he is one of the best guys you've ever met. A proper, proper human being.
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