Tuncay scored on his Bolton Wanderers debut as they beat Macclesfield 2-1 at the Reebok Stadium.
The League Two side went in front on 11 minutes when Emile Sinclair rounded Bolton keeper Adam Bogdan before finishing.
The tie was level on 56 minutes when Tuncay pounced in the box with a volley.
Martin Petrov scored the winner on 73 minutes when he raced clear to score.