Depends what system SAF goes with. In a 4-4-2 or 4-4-1-1, I can see Kagawa playing on the left, but cutting in and influencing the game from the middle.
Premier League Team: 4-4-1-1/4-4-2
===============De Gea=============
Rafael====Ferdinand====Vidic=====Evra
========Cleverley======Carrick=======
Valencia========Rooney=======Kagawa
==============Welbeck==============
Champions League Team: 4-2-3-1/4-2-1-3
===============De Gea=============
Rafael=====Ferdinand===Vidic=====Evra
==========NEW CM====Carrick========
=====Nani======Kagawa=====Young===
===============Rooney==============
NEW CM - Defence minded midfielder.