Former England call-up Graham replaces Thomson in Scotland squad
Gary Graham was called up to the England Six Nations squad this year, but is set to win his first international cap for Scotland.
'I've had about 6 concussions but the one at Murrayfield really knocked me around - that was the one I struggled to come back from'
Scotland make four changes, including a recall for Sean Maitland who lost with Saracens in the Championship last weekend
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Exeter's Sam Skinner included in updated 34-man Scotland Six Nations squad