Centre Horne and lock Swinson come in for Duncan Taylor and Jim Hamilton, who picked up calf and ankle injuries respectively in Saturday’s 24-6 victory over the United States.
“This is obviously disappointing news for both these players who were keen to impress in the short time they had on this tour,” said coach Vern Cotter.
“Everyone in the squad wishes them well and a quick recovery.
“It’s now up to Peter and Tim to continue the hard work put in by Duncan and Jim, and take advantage of this opportunity, as we prepare for another Test match.”
Scotland take on Canada on Saturday, before facing subsequent clashes with Argentina and South Africa.
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