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Mitov, who has captained his country at U17 level, has also appeared on a number of occasions for the club’s U21 side.
The 18-year-old travelled with the senior side on both of their pre-season tours ahead of the current campaign and made substitute appearances in Belgium and Spain.
Mitov was also a surprise inclusion on the first-team bench for the match at Huddersfield Town in August, when he replaced Dillon Phillips after he suffered an injury in the warm-up.
He joined Canvey Island on loan at the end of February 2015.