Saul Niguez

If rumours are to go by then Manchester United are strongly considering triggering Atletico’s sensational midfielder's release clause in the transfer window. If they can get do it and get Saul Niguez to the club then they’ll have someone that can replace both Pogba and Herrera at once.
With the Spanish international, they know they are getting a player that has the potential to be one of the best midfielders in the world. The Spanish international is creative, combative and can comfortably play in a midfield two or three. That means that they’ll not miss Pogba or Herrera if they do leave.
Even if they end up staying, he’ll provide them with a different dimension from the midfield. He’ll ease the burden of creativity immensely at the club if he does come in. Also, he’ll give United that fear factor with how he dictates games; some teams will already be beaten even before they walk into the field.