Newcastle United’s new Mackem Slayer could be back from injury in the next few weeks. Alexander Isak was one of the Magpies’ heroes in the Tyne-Wear derby last month, scoring twice to help Newcastle advance in the FA Cup. Since then, the 24-year-old forward has been met with chants of ‘who put the ball in the Mackems net’, but they have been put on hold for now. That is because the ‘frightening‘ striker is out of action with a groin injury, having been forced off during the 3-1 win over Aston Villa on January 31st. It was a worrying blow on an otherwise excellent night for the club, and it led…