Newcastle United may face a difficult summer ahead. While there is hope of a large scale rebuild at Newcastle this summer following a difficult season for Eddie Howe, lingering FFP issues may make that difficult. As a result, key players are being linked with moves away in an effort to raise funds at St James’ Park. Alexander Isak, after all, has been tipped for a move to Arsenal but the Swedish international is not the only Toon star the Gunners reportedly have on their radar. Indeed, Bruno Guimaraes is said to be of interest to the north London giants too. Recent summers have seen Mikel Arte…