They need mid-fielders. Rooney is a good choice, and works very well as a center-forward, but you need builders. You need people to move it forward. Too often I see them play it back to Blind to make that long pass towards Martial or Lingard. That shouldn't be the job of a defender. It leaves them out of position when there's a counter, which we've seen very often.

Maybe a good extra right wing defender would be good. Sometimes de Gea is all what keeps the count down. Then again, that's what you pay for with a keeper of that quality.