Stuivenberg joins Utd coaching team
Stuivenberg, 43, recently worked under Van Gaal as the Holland Under-21 coach.
In 2011 and 2012, he won the European Championship with the Dutch Under-17 team.
The former Feyenoord academy manager will be Van Gaal's assistant coach at United.
Van Gaal, who has already appointed Frans Hoek and Marcel Bout to his staff, will start work at Old Trafford once Holland's World Cup campaign is over.