In August 2008, the Bulgaria national team coach Plamen Markov called Stanislav in Bulgaria national football team in a match against Bosnia and Herzegovina national football team. Manolev made his official debut and Bulgaria won the match as a guest.
In August 2008, Bulgarian national team coach Plamen Markov included Stanislav on the roster for a game against Bosnia and Herzegovina.  Stanislav made his debut for the national team in this match, which Bulgaria won as visitors.