#5 Eric Dier (in for Jesse Lingard)
More than for Eric Dier, this change is to rest Jesse Lingard. He has started both games and looked lively on the pitch but missed an abundance of chances in the first game against Tunisia.
However, his performance against Panama proved that he is the real deal. His clever run into the box helped England to earn a penalty and then he scored a belter of a goal from outside the box.
He will be an essential player for England and the game against Belgium will be the perfect match to give him some rest.
Belgium is an attacking team and certainly has the more lethal options going forward as compared to Panama and Tunisia, thus Southgate may think to put another defensive player on the pitch to control the midfield. Eric Dier is strong and can help the team stop the counter-attacks from Belgium.