Lock Richie Gray was left out of Gregor Townsend's Scotland training squad for the November internationals because he will have a back operation.
The same back problem ruled him out of Scotland's June international tour to Singapore, Fiji and Australia.
Gray was a notable absentee from the 41-man training camp squad named by Townsend on Thursday.
According to a source close to his club Toulouse, he needs surgery to repair the niggling back problem and is set to miss at least two to three months.
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