Michael Cox for The Guardian:
Ronald Koeman has received many plaudits for Southampton’s exceptional organisation and this was arguably their most impressive tactical display of the season. The Dutchman used an unusual system to disrupt Manchester United’s buildup play, then introduced the matchwinner Dusan Tadic to great effect.
Koeman handed his wide players different responsibilities, creating a lopsided but highly efficient team. The right-sided Steven Davis tucked inside, effectively becoming an extra central midfielder, and cut off passes to Wayne Rooney and Ángel Di María in United’s inside-left channel. On the opposite flank, Eljero Elia was a surprise starter and given freedom to stay up the pitch, offering a counterattacking threat.