 Boschker was part of the Dutch squad at the 2010 World Cup.Born in Lichtenvoorde, Oost Gelre, Gelderland, Boschker made his professional debuts with FC Twente in the 1989–90 season, appearing in one game with the first team.After an irregular beginning he firmly established himself in the side's starting XI, going on to play in more than 400 official matches for the Eredivisie club.