By Graeme Bailey Southampton have been given permission to speak to Luton Town manager Nathan Jones about succeeding Ralph Hasenhuttl. Sources confirmed to 90minon Sunday evening that Southampton had decided to part ways with Hasenhuttl after the 4-1 hammering against Newcastle at St Mary’s – although it’s understood that the club’s hierarchy were already considering a change prior to the defeat. That decision was confirmed by a statement from the club on Monday morning, with Southampton in the Premier League relegation zone after winning just one of their last five games. 90min understands th…