Scotland caretaker manager Tommy Burns has rewarded a number of in-form players with a call-up to the Future squad to face Germany on 7 December.
Hartley has been impressive for Hearts this season
Rangers' Bob Malcolm, Paul Hartley of Hearts and the Motherwell pair of Steven Hammell and Martyn Corrigan have all been included.
Brighton's Adam Virgo is joined by the Aberdeen trio of Zander Diamond, Kevin McNaughton and Russell Anderson.
Scotland play the Germans in the first game of the Future Cup in Mannheim.
The team will be jointly coached by Burns and under-21 manager Rainer Bonhof.
A number of the squad are promoted from Bonhof's under-21 squad.
Rangers' reserve keeper Allan McGregor, Dundee United's Mark Wilson and Hibernian front men Derek Riordan and Garry O'Connor all make the step up.
Riordan was a late call up, following the withdrawal of Blackburn's Paul Gallagher.
Keepers: Allan McGregor (Rangers), Derek Soutar (Dundee)
Defenders: Russell Anderson (Aberdeen), Martyn Corrigan (Motherwell), Alexander Diamond (Aberdeen)
Steven Hammell (Motherwell), Kevin McNaughton (Aberdeen), Robert Malcolm (Rangers), Adam Virgo (Brighton & Hove Albion)
Midfielders: Paul Hartley (Heart of Midlothian),
Ian Murray (Hibernian), Barry Nicholson (Dunfermline Athletic), Jamie Smith (Den Haag), Mark Wilson (Dundee United)
Strikers: Derek Riordan (Hibernian), Gary McDonald (Kilmarnock), Garry O'Connor (Hibernian).