On 31 May 2017, Tombak made his professional début in a 2–2 away draw against Levski Sofia, playing full 90 minutes.

[3] Tombak publicly expressed his delight and stated that being part of the first team was a "dream come true".

[citation needed] Tombak was called-up for the Bulgaria U18 squad for the friendlies against Macedonia U18 on 9 and 11 May 2017.

[9] He scored his first goal for the Bulgaria U21 national side on 17 November 2020, in the 3:0 home win over Estonia U21 in a UEFA European Championship qualifier.

[10] Tombak made his debut for the Bulgaria national team on 8 June 2024 in a friendly against Slovenia at the Stožice Stadium.