Career
Mombaerts began his coaching career with Paris Saint-Germain, taking charge between October 1987 and February 1988. Mombaerts was manager of Guingamp during the 1989-1990 season. He then managed Cannes between January 1992 and December 1992, and Toulouse from 2001 to 2006.
After coaching their under-18 team, Mombaerts became manager of the French under-21 team in April 2008.
He left that position in October 2012. Mombaerts became manager at Le Havre in December 2012.
He resigned in December 2014. He was appointed as the head coach of Japanese club Yokohama F. Marinos in December 2014.