Jack van Poortvliet has been England's first choice scrum-half in this year's Six Nations but is yet to hit the heights in his fledgling international career.
The Leicester player won the Premiership under Borthwick's tutelage last season. He now has 10 caps under his belt but the step up to Test level has not been an easy one and at Twickenham on Saturday, he faces the best in the world.
Antoine Dupont has been there and done that, and continues to do so at the highest level.
The France captain is the tournament's leading points scorer (45) after three games and is joint second for the most assists (two).
Add to that a combined total of 315 metres made, which is the third highest, and you quickly realise that most of what France do well goes through their diminutive talisman.