de cock made his debut for club brugge on 29 november 1996 in the competition against aa gent (1–3 to club). it was however after the departure of eric deflandre that de cock got a permanent place in the side. when brian priske came, he lost his permanent place in the side. in august 2007 he moved to fortuna düsseldorf on loan. he then played for oberhausen and oostende. in the summer of 2010 he joined roeselare on a one-year contract.