Right after the goal, Belgium striker Michy Batshuayi was seen in the England goal mouth booting the ball in celebration.
England haven't won a knockout game at a tournament since 2006 and Southgate insisted he had to seek every possible advantage ahead of what he described as the Three Lions' "biggest game for a decade."
Belgium will now meet Japan in last 16 clash while England will face Colombia.
Adnan Januzaj returns to Old Trafford having barely played in the Bundesliga with both Manchester United and Borussia Dortmund agreeing it was in the player's best interests to end the arrangement.
Despite Manchester United claiming a 3-0 victory at Aston Villa, Moyes was unhappy with the number of tackles made on the Belgian-born youngster.
Foreign-born players can be inducted to national teams on grounds of residency but Wilshere feels it is rather unfair as it does not happen in other countries.
The dual nationality Belgian and Albanian prospect's contract expires at the end of the season, with his agent claiming interest from a string of top clubs all over Europe.
Teenage starlet Adnan Januzaj scored twice as Manchester United came from behind to win 2-1 at Sunderland
Danny Welbeck, Chris Smalling, Fabio Da Silva and substitute Adnan Januzaj put United 4-0 up after 49 minutes, but they took their foot off the pedal and plucky Kitchee gave the scoreline some respectability with two fine goals on a humid but dry night.
The English champions fell behind in the very first minute but they recovered to lead 2-1 heading into the second half thanks to Jesse Lindgard's strike and a Yokohama own goal.
David Moyes took heart from sparkling debuts by two emerging stars after his reign as Manchester United manager got off to a low-key start with an upset loss in Thailand.