He said on Tuesday that he had suffered with bladder cancer for more than two years and after it spread to his prostate he had surgery to remove both organs.
"It is an operation to mop things up - that's a technical term," St John told the club website. "There is nothing you can do about it other than battle on."
Liverpool said manager Brendan Rodgers had sent St John, who scored nine goals in 21 games for Scotland, a signed team shirt with a personal message.
The former striker helped the club win promotion to the top flight and to two league championships, as well as FA Cup final glory in 1965 when he scored the winning goal against Leeds United in extra time.
(Reporting by Neville Dalton, editing by Tony Jimenez)
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