Career
De Jongh made his professional debut in 1995 at TVM team where he stayed until 1999. From 2000 to 2005 he was part of Rabobank, while he made the move to Quick-Step–Innergetic in 2006. De Jongh retired as a rider after the 2009 season.
He was a Directeur sportif at Team Sky for three years, leaving in October 2012 after admitting he had taken illegal substances earlier in his career.
In January 2013 he joined Team Saxo-Tinkoff as a sports director