His primary focus was in mountain bike racing, however, he has also taken part in elite road, cyclo-cross and track cycling.

During a press conference he admitted he used EPO simply because of his desire to win gold at the Olympics.

[4] He wrote a book called Positief, which tells the story of his life as an athlete and the consequences of his positive test.

Filip was suspended from professional racing until 14 January 2006 based on his positive test result.

He signed a three-year contract to race for Landbouwkrediet-Colnago on the road and Versluys-Landbouwkrediet-Sportstech on mountain bikes.