[2] On 12 October 2013 Nasko made a debut in the first squad during the 3–0 win over PFC Neftochimic Burgas for the Bulgarian Cup.
This time he was involved in A Grupa game but even his appearances was unable to prevent the 0–1 loss from CSKA Sofia.
[6] On 2 March Nasko Milev came again as a substitute during the final minutes of the 3–0 home win over PFC Marek Dupnitsa.
[8] A week later, on 23 May, Nasko Milev replaced Filip Filipov in the 90th minute of the 1–2 away defeat from Beroe Stara Zagora.
[12] On 28 February, Nasko Milev came on as a substitute and in the 89 minute he scored his first ever goal in an official game during the 2–2 draw with PFC Pirin Blagoevgrad.
[13] On 6 March 2016, Nasko Milev was included in the starting line-up of Botev Plovdiv for the 1–1 away draw with Beroe Stara Zagora.
[18] On 29 June 2016 Milev scored a goal for the 5–0 win over FC Oborishte in a preseason friendly game.