Januzaj took aim from the edge of the box and curled a dipping effort into the top corner, earning Roberto Martinez's men a decisive win and earning them top spot in Group G.
Courtois, though, insists he would have merely caught the ball, with Pickford instead choosing to dive.
"The goalkeeper is 10cm smaller than me," he told Voetball24.
"I would have caught it. He was too busy throwing his legs in the air."
Courtois stands at 6ft5, while Pickford is 6ft1. The Everton goalkeeper was widely criticised for his display against Belgium, with many pundits wondering why he chose to use the "wrong" arm when diving.
"His feet are off the ground when he’s jumping. He goes with his wrong hand. It’s just a bit weird," said pundit Gary Neville to ITV Sport after the game.
Ironically, the defeat may leave England with a clearer route through the tournament; while Belgium face Japan in the last 16, they will then face one of Brazil or Mexico in the quarter-finals if they progress. The Three Lions, meanwhile, will play Colombia, and could then face Sweden or Switzerland, provided they beat Jose Pekerman's side.
Belgium have yet to truly live up to their 'Golden Generation' tag, though they came through the group stages with nine points from a possible nine.