Allan McGregor returns for Scotland's World Cup qualifier against Croatia.
Dundee United defender Andrew Robertson has been called up to the Scotland U21 squad for the first time.
London, Glasgow, Cardiff and Dublin are among 39 cities put forward by 32 countries to stage Euro 2020.
Scotland will take on the United States in a Hampden friendly in November, the SFA has confirmed.
Shaun Maloney's late free-kick snatched a 2-1 victory for Scotland in their Group A World Cup qualifier in Macedonia.
Scotland boss Gordon Strachan claims the manner of his team's 2-1 win in Macedonia was "beyond his dreams".