Ratkov is of mixed
Bulgarian and
Croatian descent. He holds
both Serbian and
Bulgarian citizenships which made him able to represent
Serbia or
Bulgaria; he was also eligible to play for
Croatia through his mother's aforementioned descent. In September 2023, he declined a call up for Bulgaria, committing himself to the Serbian national team. Ratkov was selected in Serbia's squad for the
UEFA Euro 2024, but did not make an appearances in the tournament. ==Style of play==