[2] He made his professional debut for Jong Ajax in an Eerste Divisie match against Fortuna Sittard on 16 August 2014.

[4] In a match against RKC Waalwijk for Jong Ajax, Alblas was forced off after having torn his anterior cruciate ligament, which meant that he was out for the rest of 2015.

[7] His official return to the pitch came late – mainly because third goalkeeper André Onana was often preferred as the starter for Jong Ajax – on 19 August 2016.

On that day, Jong Ajax played a home match against Den Bosch, where Alblas was the team captain.

On 28 September 2018, Alblas injured his knee in a league match in the Eerste Divisie at home against Go Ahead Eagles and was replaced by Marco van Duin.

On 23 May 2021, Alblas won promotion with NEC to the Eredivisie, by beating NAC Breda 2–1 in the final of the play-offs.