England’s Joe Cokanasiga and Mark Wilson are doubts for World Cup opener

• Both players miss full training in Japan with knee injuries• Jamie Ritchie to miss Scotland’s opener against IrelandJoe Cokanasiga and Mark Wilson have emerged as potential doubts for England’s opening match of the World Cup against Tonga next Sunday with both players carrying knee problems.Both have been unable to take part in full training at England’s training base in Miyazaki, instead undertaking what Eddie Jones has described as a “mini pre-season” before the Group C game in Sapporo. Related: Rugby World Cup 2019: England team guide Related: ‘Preparation is everything’: the real Eddie …