WP Nel, Tim Swinson and Rob Harley have all been ruled out of the remainder of Scotland’s autumn Test campaign.
Edinburgh prop Nel suffered a fractured arm during Saturday’s victory over Samoa while Glasgow lock Swinson sustained a broken hand.
Swinson’s Warriors team-mate, Harley, suffered a knee injury in training last week and will also miss the upcoming encounters against New Zealand and Australia.
Winger Tommy Seymour suffered a toe injury in the 44-38 triumph but the Scottish Rugby Union confirmed he would return to training this week following treatment.
Former Glasgow prop Welsh, 31, won the last of his 11 caps in the 2015 World Cup quarter-final against Australia.