Southgate's team included the returning Luke Shaw and Joe Gomez, with both players impressing as Shaw set up Rashford's opener and Gomez looking composed throughout.
Saul's lively performance had the Spanish media asking why he did not play a single minute at the World Cup despite being part of the squad, while forward Rodrigo, scorer of the winning goal, also gave the team a more direct feel.More news: Post Malone crashes his $323k worth rolls Royce
"I believe I've been through an experience that is as pressured as you're ever going to face at any club or worldwide team in getting through a World Cup, so I'm totally comfortable with that, and what's beyond that is to be decided".
Having got the assist to put England 1-0 up in the first half, Shaw's return to global football had started brilliantly.
Judging by what Southgate said late on Saturday night, such discussions have not yet taken place. "He scored a goal and he was in the penalty box more".
"We knew it was going to be a hard game".More news: Obama Slams Donald Trump Publicly For First Time
"We have got 19 matches, it's not very long, but, in my opinion, we have got the best group of players in the country here".
Meanwhile, England have called up Leicester City duo Ben Chilwell and Demarai Gray for Tuesday's friendly against Switzerland at the King Power Stadium, the FA said on Sunday.
"We're seeing that with some of our junior teams".
Spain had 54.7 per cent of possession against England, a marked contrast to playing more than 1,000 passes against Russian Federation, but they compensated by shutting down their opponents with remarkable efficiency thanks to an intense pressing game, and maintained 85 per cent passing accuracy when they did have the ball. "I knew this period would be an exceptional challenge and will tell us a lot about exactly where we stand, but I think that's good for us". We can either go back to our old style and we'll never be a top team, or we can keep trying to do what we do and suffer at times.More news: Sacha Baron Cohen sued for $95m by Roy Moore