Amid heavy interest from Premier League rivals, Newcastle United are confident they can convince one of their star forwards to stay. Having eased their PSR concerns at the end of June, Eddie Howe will be hoping that the rest of the club’s summer is just designed to improve their playing staff. Paul Mitchell’s appointment as the club’s new sporting director will be significant in that regard, renowned for scouting and recruitment expertise. Mitchell is thought to have a £100m transfer budget at Newcastle this summer, ready to provide Alexander Isak and Bruno Guimaraes with further reasons to st…