If Erik ten Hag had drawn up a list of things he wanted to see from Manchester United’s trip to Southampton, you’d imagine that he departed St Mary’s having ticked many off them off. A clean sheet for Andre Onana. A strong display from Matthijs de Ligt and Lisandro Martinez, the understanding growing between the two former Ajax men. A solid debut off the bench for Manuel Ugarte, a comfortable afternoon for the seldom-seen Christian Eriksen, some gorgeous Joshua Zirkzee touches, and a much-needed, confidence-boosting strike from Manchester United’s much-maligned number ten Marcus Rashford. Off …