Manchester united has always excelled when a natural defensive midfielder has played with a more attacking minded midfielder in the middle of the park. Most recently Roy Keane and Owen Hargreaves have filled that position and allowed players like Carrick and Scholesy to run the midfield. I think currently united don't have a player in that mode and that affects us greatly. i think a player like that will allow players like Cleaverly and Kagawa when they are allowed to play, to play freely and more offensively. A suggestion will be Newcastle's Tiote. A tireless worker who will do all the dirty work others would rather not do.