Janssen played professional football from 1982 to 2000 with, in chronological order, NEC, Fortuna Sittard, PSV, Kortrijk, again Fortuna and finally again with NEC.
Janssen played professional football from 1982 to 2000, in chronological order, at NEC, Fortuna Sittard, PSV, Kortrijk, again at Fortuna and finally again at NEC.