Powell and Kagawa are attacking midfielders, not strikers.
Well we have Carrick, Cleverley, Scholes, Giggs, Fletcher, Anderson as our CM's at the minute, Scholes and Giggs aren't getting any younger, Fletcher has his problems we still don't know the situation on him but even if he does come back he won't feature a great deal, Ando will be sold imo.
What we need is a strong and powerful CM who can break up play but can also create and score the odd goal, someone like Martinez or Strootman imo. Also don't forget that we have players like Tunnicliffe, Petrucci etc who might be called up next season.