Question: What is the birthdate of this Dutch professional football manager and former player, who was a new signing for the 1998-99 FC Barcelona season?
Sentence (from "2004–05 FC Barcelona season"): The 2004-05 season saw Fútbol Club Barcelona end their six-year wait for the La Liga title, having not won the league or, indeed, any trophy since the 1998–99 season and thus La Liga trophy returned in Barcelona's trophy room.
Relevant evidence: No