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Scotland manager Craig Levein's revealed who he's calling up for games against Wales and Republic of Ireland in Dublin later this month.
Teenager Forrest and 25-year-old Martin, who was born in Brighton, have both been included.
Leeds striker Ross McCormack and Blackpool goalkeeper Matt Gilks have been recalled, but in-form Wolves striker Steven Fletcher's international exile continues.
Levein was unable to call up the injured Alan Hutton, Craig Gordon and Graham Dorrans, while fitness reasons have forced Mark Wilson out.
Darren Fletcher is unavailable given Manchester United's participation in the Champions League final.
St Johnstone midfielder Murray Davidson and Watford's Don Cowie have dropped out of the squad following the defeat by Brazil in March, while Kilmarnock captain Craig Bryson and in-form Motherwell wide player Jamie Murphy have missed out.
Peterborough striker Craig Mackail-Smith is in the squad after making his debut against Brazil, although his presence will depend on the outcome of the npower League One play-off semi-finals.
Here's a full list of the squad for Carling Nations Cup matches against Wales and Republic of Ireland next week:
G Caldwell (Wigan)
R Martin (Norwich)
Bannan (Aston Villa)
Morrison (West Brom)