[5] Three months after he joined CSKA and a single appearance for the first team, Minchev moved to Slavia Sofia.
[6] He made his debut for the team in a league match on 10 September 2017 against Lokomotiv Plovdiv won by Slavia with 5–2 result.
[10] Minchev ended his first half of the 2017–18 season with 5 goals and 5 assists in 19 league matches, attracting interest from Russian and Kazakhstan clubs.
[13] 11 days later he made his debut for the national side in a match, coming on as a substitute in added time of the second half.
[14] In August 2024, Minchev was once again called up, being selected by manager Ilian Iliev for the September UEFA Nations League matches against Belarus and Northern Ireland,[15] earning his second cap against the former.