Newcastle United are expected to invest heavily over the January transfer window. After an underwhelming summer of business, pressure is ramping up on sporting director Paul Mitchell to deliver signings in January. Newcastle United missed out on all of their top targets over the summer after leaving it far too late to get any deals over the line. The transfer saga with Crystal Palace’s Marc Guehi rumbled on until the final few days of the summer window before Newcastle walked away from a deal. Likewise, Newcastle also targeted a right-sided winger but failed to get a deal done after a last-gas…