[1] Sluka made his professional Slovak Super Liga debut for Žilina against Nitra on 28 July 2018.
[2] In September 2023, Sluka returned to Slovakia with ViOn Zlaté Moravce on a one-year deal.
[3] Sluka was first recognised in a senior national team nomination on 28 May 2019, when coach Pavel Hapal named him as an alternate defender for a double fixture in June - a home friendly against Jordan, to which 29 players were unusually called-up and a UEFA Euro 2020 qualifying fixture against Azerbaijan, played away on 11 June 2019.
[4] He also featured as an alternate under Hapal's successor Štefan Tarkovič, for example ahead of two international friendly fixtures against Norway and Finland in March 2022.
[5] In December 2022, Sluka was first shortlisted in the nomination by Francesco Calzona, who joined the team in late summer, for senior national team prospective players' training camp at NTC Senec.