Dier, 23, wore the captain's armband in the worldwide friendly clash that finished 0-0 at Wembley, and although it was a goalless game, it definitely gave some encouragement ahead of the World Cup in Russian Federation next summer as Gareth Southgate was forced to field a second-string side.
Ruben did everything that I know he can.
England went toe-to-toe with their old enemies and impressed fans and critics alike with their mature display - something that Southgate also revealed he had been left delighted by in quotes published by Sky Sports.
"I think there was a freshness and energy about it". He's got so many good attributes, top attributes, and that's why we put him into the team.
"At times it was hard for them to press us because of the composure we showed and the system we played, so I think it was a brilliant experience for our players".
He beamed: "I'm really not surprised by what [the young players] have done because they've shown that previously in other ages and this week in training".
"If we'd won it would have been better, but it was a tough game, and a good game from me to learn from".
"He's certainly made really important saves tonight".
The 20-year-old has previously played for the Under-16s through to the Under-21s.
Loftus-Cheek was pulling the strings in midfield as England pushed for a goal, including feeding captain Dier to get away a cross that Mats Hummels had to hack behind his own goal. It took him 10 minutes to realise, "I'm OK here, I can play" - and he is capable of anything.
"We would have played Jack in the game against Brazil".