Forwards Hamish Watson, Willem Nel (both Edinburgh) and Sam Skinner (Exeter Chiefs) are joined by Glasgow Warriors pair Stafford McDowall (centre) and Grant Stewart (hooker) in returning to the squad.
As a consequence of their inclusion the following eight players, split evenly between injury and those released back to their clubs, are no longer part of the current Scotland squad.
They are injured quartet scrum-half George Horne (shoulder), prop D'arcy Rae (ankle), hooker George Turner (graduated return to play protocol for concussion) and centre Chris Dean (back), plus prop Alex Allan, back-row Robert Harley (both Glasgow Warriors), back-row John Hardie (Newcastle Falcons) and stand-off Duncan Weir (Worcester Warriors).
Full-back Stuart Hogg will not join the squad in the camp this week as he is not being considered for this Saturday's game against Wales, following the shoulder injury he sustained against Ireland in the second round of the championship.
He remains under the joint care of the Glasgow Warriors and Scotland medical teams, with his rehabilitation progress and review ongoing.