Southgate chose players in the group stage who were happy to receive the ball at their feet but were hesitant to stretch the opposition's defence with their movements.
The Liverpool midfielder believes that Sancho and Bellingham can give England additional insight about Germany ahead of their round-of-16 match.
England's Euro 2020 campaign has gotten off to a slow start, with only one goal scored in two games. It may well be time for Southgate to forsake his cautious approach.
In-form striker Patrik Schick, is a surprise contender for the Golden Boot with three goals to his name already.
After finishing second in the recently concluded Premier League season, Manchester United's manager has conceded that they have to strengthen themselves.
Gareth Southgate has selected a squad filled with exciting young players, who might prove to be the difference at the showpiece event.
Jadon Sancho-inspired Borussia Dortmund beat RB Leipzig in a thriller to help the Bavarians clinch the German league title.