He made his senior debut for the club on 28 September 2013, replacing Fernando Silva for the final 12 minutes of an A Group match against Levski Sofia at Ovcha Kupel Stadium.

On 17 May 2014, Karabelyov scored his first goal in a 2–0 home win over Pirin Gotse Delchev.

One year later, he started in the A Group for first time in a 3–1 home loss against Cherno More Varna on 22 May 2015.

On 7 March 2016, Karabelyov was called up for the first time to the senior Bulgarian squad for friendly matches against Portugal and against Macedonia.

[7] He made his debut on 7 June 2019 in a Euro 2020 qualifier against Czech Republic, as a 64th-minute substitute for Kristiyan Malinov.