Krastev made his professional debut in a 0-2 league loss from Pomorie on 27 February 2016.
Levski drew 2-2 and Krastev played full 90 minutes on the pitch.
[3] 6 days later he became man of the match in the Eternal derby of Bulgarian football against CSKA Sofia, won by Levski with 2-1.
[8] In February 2022, Krastev signed a two-and-a-half-year contract with Slavia Sofia.
[9] On 17 March 2017 he received his first call up for Bulgaria's U21 team,[10] but on 21 March 2017 he joined Bulgaria's senior team for the match against Netherlands after the injury of Vladislav Stoyanov,[11] during which he remained on the bench.