Newcastle United sporting director Paul Mitchell has not had it easy in the opening few weeks of his tenure. Indeed, Newcastle endured a summer transfer window so underwhelming it was publicly slammed by club legend Alan Shearer, with Eddie Howe’s squad not significantly strengthened. Mitchell’s arrival is also said to have frustrated head of recruitment Steve Nickson, who may have been side-lined following the appointment of the new sporting director. Recent reports suggest Mitchell is unhappy with how things are going at St James’ Park and the annoyance is not believed to be confined to him …