The trio were all withdrawn during the 31-20 win over England at Murrayfield.
Dempsey has damaged a bicep, Ritchie has a knee issue, while a shoulder problem rules Dobie out.
At the weekend, head coach Gregor Townsend suggested all of the injuries were "serious" and a squad update from Scottish Rugby says the players have returned to their clubs for assessment.
Townsend is scheduled to name his team to face Wales on Thursday, with the squad currently training in Spain.











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