By Euan Burns Newcastle United’s season has been plagued by injuries so far and when they host Luton Town in the Premier League on Saturday afternoon, they could be without a recognised striker for the first time. Alexander Isak had to be withdrawn during the 3-1 win against Aston Villa on Tuesday night thanks to a groin injury, and there is a very good chance that he will miss the game against Luton. At the same time, Callum Wilson has a calf issue and, while not fully ruled out, may only make the bench on Saturday. That means that Eddie Howe is likely to use one of his usual wide players in …