"I want to win everything with Ludogorets," Stoyanov said. "I return to the Bulgarian championship more mature and more experienced, with many matches in European competitions."
Stoyanov, 25, became Ludogorets's third new signing during the Bulgarian league's mid-season break after Serbian midfielder Nemanja Milisavljevic and Colombian midfielder Sebastian Hernadez.
Ludogorets, who won their maiden league title last year, top this term's standings with 38 points from 15 matches.
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