Instead, he made his debut in professional football for Eerste Divisie club Eindhoven in the 1993–94 season, on loan from PSV.
[1] In his first season, Fortuna, who were managed by Bert van Marwijk, reached seventh place and qualified for the Intertoto Cup.
[citation needed] Following Fortuna Sittard's relegation, Hermans remained in the Eredivisie, having been signed by De Graafschap.
In the 2003–04 Eerste Divisie season, despite finishing in sixth place in the regular competition, Hermans helped De Graafschap win one of the two playoffs groups and achieve promotion back to the Eredivisie.
On 31 August 2006, Hermans was signed by Willem II, who were looking to add experienced players to their young squad.
[1] Due to a back injury,[10] his playing time in the second part of the season was limited to one substitute appearance.
Immediately after retiring, Hermans started his managerial career at Willem II, coaching various youth teams.