Answer
Vincent Janssen's coach in his first season at Royal Antwerp was Franky Vercauteren. Vercauteren is a Belgian football manager and former player who played as a midfielder. He has managed several Belgian clubs, including Anderlecht, Gent, and Royal Antwerp. He also managed the Belgian national team from 2002 to 2005. Vercauteren is known for his attacking style of football and his ability to develop young players.