Early years After progressing through
PSV' youth teams, Heerkens moved to
Go Ahead Eagles in 2010. He made his professional debut for their first team on 16 August 2010, starting in a home match against
Sparta Rotterdam. Just a few months later, on 1 October of the same year, he notched his first goal in professional football during an impressive 8–0 victory against
Dordrecht.
Go Ahead Eagles Following three successful seasons with the club from
Deventer, Heerkens joined
Willem II, signing a two-year contract on 13 June 2013. He made his debut for the
Tricolores in a home match against
Den Bosch on 4 August 2013, starting in a 2–2 draw. Throughout the
2013–14 season, he made 28 league appearances as the club clinched the
Eerste Divisie title and secured promotion to the
Eredivisie. Heerkens grew into
team captain of Willem II, replacing
Pol Llonch and
Jordens Peters in that position. In September 2018, he extended his contract with Willem II until 2021. In June 2021, he signed a one-year extension, keeping him in
Tilburg until 2022. On 7 May 2022, Heerkens celebrated his 200th appearance for Willem II in a 2–0 victory against
Heracles Almelo. However, the season concluded with the club facing their relegation to the Eerste Divisie after Heerkens led the club to promotion eight years prior. Despite relegation, he signed another one-year deal, extending his expiring contract until 2023. In June 2023, he signed a third consecutive one-year contract extension, keeping him part of Willem II for his eleventh season. ==Honours==