Leicester Tigers back-rower Luke Hamilton, a former Wales Under-20 player, was included along with Sale's 28-year-old winger Byron McGuigan, who is joint top try scorer in this season's English Premiership.
But there was no place for Edinburgh back-rowers John Hardie and Magnus Bradbury, who are both suspended by their club for disciplinary reasons.
Hamilton, 25, whose father is Scottish, was one of three new players included through family connections, along with Edinburgh's London-born prop Darryl Marfo whose mother is Scottish.
"The players selected have worked exceptionally hard at their clubs to earn inclusion in the national squad and we're looking forward to working with them throughout the autumn series," Townsend said.
"We’re facing two of the world’s top three sides after a significant challenge from Samoa in our opening game. It will be an excellent challenge for our players.”
Scotland have been hit by injuries to 10 players, including captain Greig Laidlaw and Fraser Brown.
Fullback Stuart Hogg and winger Tommy Seymour return having missed the summer tour on Lions duty.
Forwards
Simon Berghan, Jamie Bhatti, John Barclay, Scott Cummings,
Cornell du Preez, Zander Fagerson, Ross Ford, Grant
Gilchrist, Jonny Gray, Rob Harley, Luke Hamilton, Darryl
Marfo, Stuart McInally, WP Nel, Jamie Ritchie, Tim Swinson,
Ben Toolis, George Turner, Ryan Wilson, Hamish Watson
Backs
Phil Burleigh, Alex Dunbar, Dougie Fife, Nathan Fowles,
Chris Harris, Nick Grigg, Stuart Hogg, Peter Horne, Ruaridh
Jackson, Lee Jones, Huw Jones, Byron McGuigan, Ali Price,
Henry Pyrgos, Finn Russell, Tommy Seymour
(Reporting by Neil Robinson, editing by Ed Osmond)
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