Sunderland face stiff competition to keep hold of a number of key players this summer. The likes of Jack Clarke, Anthony Patterson and Dan Neil have been the subject of interest from the Premier League in recent months. Sunderland have already managed to tie Chris Rigg down to a new contract, while Neil had rejected their opening offer. With the club eager to keep their prized assets, they also continue to look to the future of their academy players too. Rigg is one of many to graduate from the academy with bags of potential and the Black Cats won’t want to miss on the next star to come throug…