The former Celtic midfielder was a very impressive part of Scotland’s two victories against Albania and Israel over the last week.
And he carried that quality form into his club duty, proving influential in their English Premier League clash with Fulham at Craven Cottage.
Armstrong has had to be patient to get his chance under Mark Hughes, starting just twice in the league going into today’s game.
But he’s now in the Southampton team and showing exactly why the club spent £7million on him.
While the Saints lost today’s game 3-2, Armstrong can be proud of his two goals – the first of his spell at the club:
Southampton will be hoping to see more of that from Armstrong – and that can only be a good thing for Scotland, who will want the midfielder to play an important role in qualification for Euro 2020.