Bonhams, who will auction the collection on October 20 under instruction from the executors of his estate, say the guide price for the medal will be between 90,000 and 120,000 pounds.
Best, who died aged 59 in 2005 after a long battle with drink and its associated health problems, was part of the United team became the first English side to win the European Cup, scoring one of the goals in a 4-1 victory over Benfica.
The auction will also include a replica of the European Cup winners' medal which was made after he misplaced the original.
Collectors will also be able to bid for Best's 1968 English Football Writer's Association Footballer of the Year trophy which is expected to fetch up to 100,000 pounds.
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