Dutch coach Co Adriaanse has resigned from Porto after one season in charge because of what he describes as a “rift in confidence” with the club’s board.

Assistant Jan Olde Riekerink, coach Chris Kronshorst and goalkeeping coach Wil Coort have also left the club.

Adriaanse left AZ Alkmaar in the summer of 2005, and although Porto won the Portuguese Premier League title last season, the coach was criticised for constant tactical changes.