Both Gavin Rae and Ross McCormack have been selected.
George Burley said: "I'm really looking forward to getting the boys together again as we step up our preparations for the crucial double-header against the Dutch and Iceland.
"The gathering gives us the chance to have a couple of training sessions and to work on the tactics for the games.
"We have a strong group of players who are passionate about playing for Scotland. We are all ready to take our country to South Africa."
The full squad
Gordon (Sunderland), Marshall (Norwich), McGregor (Rangers); Alexander (Burnley), Barr (Falkirk), Berra (Wolves), Broadfoot (Rangers), Caldwell (Celtic), McAllister (Bristol City), McManus (Celtic), Naysmith (Sheffield United), Weir (Rangers); Brown (Celtic), Commons (Derby), Ferguson (Rangers), D Fletcher (Manchester United), Hartley (Celtic), Morrison (West Brom), Rae (Cardiff), Robson (Celtic); Clarkson (Motherwell), S Fletcher (Hibernian), Iwelumo (Wolves), McCormack (Cardiff), K Miller (Rangers), L Miller (Aberdeen).