Scotland Rugby World Cup: Uncapped Glasgow Warriors pair join training squad
Head coach Gregor Townsend kept two places aside when he named a 42-man squad three weeks ago and lock Cummings and centre Steyn have forced their way in after a strong finish to the season, which culminated in a narrow Guinness PRO14 final defeat by Leinster on Saturday.
Townsend said: "Scott has played very well in some crucial games for Glasgow and has really taken his game to the opposition.
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Hide AdHe was impressive in his ball carrying, defence and his all-round work-rate on Saturday against Leinster and we look forward to working with him and the other four second-rows in our squad."
He added: "Kyle has made an excellent impact since his debut for Glasgow earlier this season and has displayed strong defensive capabilities as well as a providing go-forward for his team when carrying ball."