Sunderland fans have enjoyed the opportunity to take a further look at their squad ahead of next week’s season opener. Sunderland have played out six preseason friendlies so far, picking up three wins, one draw and two defeats. The Black Cats still have one final fixture against Marseille this weekend, though Regis Le Bris is likely to already have a good understanding of who could line up against Cardiff City. A number of players have given themselves a brilliant chance at starting in Wales, with Chris Rigg and Romaine Mundle two names that have impressed in recent weeks. However, others have…