After 3 seasons with FC Oss, Balk went on trial with League of Ireland Premier Division club St Patrick's Athletic, from the capital city of Dublin.
On 5 July 2017 he played the full 90 minutes as a trialist in a 1–0 friendly win over Scottish Premiership side Heart of Midlothian at Richmond Park.
After impressing fans and coaching staff with his passing, positional sense and tackling, Balk signed a contract with the Saints on 7 July 2017, becoming the first Dutch player to play for the club.
[5] He scored his first goal in the clubs crucial 4-2 win against Cork which helped St Pats stay in League of Ireland Premier Division.
On 9 September 2023, Balk returned to Dublin to play in a friendly for a St Patrick's Athletic legends team for Ian Bermingham's testimonial match.