Career
Gergel made his the Corgoň Liga debut in the 7–1 defeat against MŠK Žilina on 14 July 2007. After his first season he relegated with Trenčín to the Second Division. He scored 10 goals in the 2008-2009 season and 3 goals in the 2009-2010 season.
In September 2010, he signed four-year contract for MŠK Žilina for an undisclosed fee.
He played four games for Žilina at the 2010-2011 Union of European Football Associations Champions League group stage.