[1] In October 2019, Vestergaard sat on the bench for two Danish Superliga games, however, without getting his debut for the club.
On 23 January 2020, shortly after undergoing cruciate ligament surgery after being injured in the same month, 18-year old Vestergaard signed a new deal with OB, running from 1 July 2021 and 1,5 years onwards, which also secured him a permanent promotion to the first team squad from the summer 2020.
[5] To gain some experience, it was confirmed on 24 June 2022, that Vestergaard would spend the upcoming 2022-23 season on loan at Danish 2nd Division club Kolding IF.
Following this, OB also confirmed that Vestergaard would spend another season on loan in Kolding.
[7] On April 18, 2024, Kolding confirmed that they had signed Vestergaard to a permanent deal until June 2027, effective from the 2024-25 season.