Cornelis was part of a last minute transfer deal in the late evening of 31 August 2009. Cercle Brugge and RC Genk came to an extensive agreement: Cornelis was sold to Cercle Brugge, his team mate Jelle Vossen joined him on loan. Thomas Buffel made the opposite move.
- Belgish League-Champion 2003 and 2005
- Belgish Cup-Winner 2002, 2004 and 2008