Nikolov began his career with Slavia Sofia at age of 7.[2] In 2022 Raychev was promoted to the second team of Slavia, playing in Third League. On 30 September 2022 he scored 5 goals in a league match against CSKA 1948 III.[3] Roberto made his professional debut on 192 February 2023 in a league match against Ludogorets Razgrad.[4] He scored his debut goal for Slavia's first team on 6 June 2023 in a league match against Lokomotiv Sofia.[5]
International career
In 2021 he was part of Bulgaria U17 and helped the team to qualify for European tournament.[6]