The meeting with Japan has been penned in for November 9 at a venue to be decided, although caps will be awarded unlike when the two last met in 2010.
The other two Tests, against the Springboks on November 17 and the Wallabies on November 23 will be played at Murrayfield.
Scott Johnson remains Scotland's interim coach, with no announcements made regarding his future since the end of the Six Nations, during which the Scots won two games to finish third in the table.
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