While England had an impressive summer campaign at the World Cup, defying all expectations to reach the semi-finals over in Russian Federation, they did so with a relatively young and inexperienced side.
'Our first half performance was embarrassing but it's great we can shout at each other to change things, ' said the Tottenham defender, who impressed as England bounced back from Saturday's 2-1 Wembley defeat to Spain.
"So numerous lads were playing their first 45 minutes of the season", said the England manager.
So, take a look at the slideshow above to see which players we feel were fortunate to wear the three lions as one of England's elite.
Southgate, meanwhile, said of the row between the players at half-time: 'We expect that, we encourage it. They recognise when they want to be better.
Marcus Rashford got ahead of Alexander-Arnold with the eye on goal, but flashed his effort way off target on 26 minutes. "There was plenty of room for improvement".
The 20-year-old's two goals will put pressure on the injured Raheem Sterling, who was preferred by Southgate in the World Cup starting line-up but is without an global goal in 26 matches.
Vladimir Petkovic's side thrashed Iceland 6-0 to kickstart their Nations League campaign and were the better side for the first 45 minutes at the King Power.
"We could have been two or three-nil down at half-time", admitted Rose, who was man-of-the-match.
With their rendition of Atomic Kitten's "Whole Again" in tribute to Gareth Southgate on loop for nearly the entire game, Rashford's goal was a rare moment of respite.
However, it almost cost the hosts the opening goal twice in a matter of seconds inside the first 10 minutes.
Southgate has lamented England's failure to produce midfielders of the calibre that Croatia and Spain possess.
The reward arrived in the 54th minute as Kyle Walker arrowed Rose's over-hit corner back into the box from the right and Rashford stroked home unmarked at the far post.
Renowned for his defensive steel, John Stones was quickly into the thick of things, preventing Shaqiri from finding the net from close range.