"We are always learning about the players more in the really big matches and the really high-pressure games", Southgate said.
The 49-year-old praised the quality of midfielders available to England's European rivals ahead of Thursday's win over Montenegro, and is fearful his team could be exposed by top-quality opposition next summer.
Harry Kane has urged fans not to boo any England players after Joe Gomez was jeered in the 7-0 win against Montenegro at Wembley on Thursday.
Southgate has been looking to play 4-3-3 ever since the World Cup but recently admitted that he might have to revert to three at the back because England can not get enough midfield control.
He was involved in multiple discussions after the incident and is pleased with how everything was handled before Southgate's side clinched their place at Euro 2020.
With three group games and a possible semi-final and final at Wembley, Euro 2020 is nearly a home tournament for England and Abraham is confident Southgate's men can get their hands on the silverware. "The gifts we handed to the English team shouldn't happen at this level".
'I don't remember Euro 96, I wasn't born, but hopefully we can make it a great occasion.
The Telegraph report that Gomez was "devastated" after being booed and that his teammates were both stunned and angry as the booing could be heard as Gomez was warming up to get ready.
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