We replaced Keane with Carrick so I don`t see a problem to have a different kind of player now, except there will probably be another midfielder coming..
Also with Fred in midfield , his transition to attack and workrate, we could be pressing higher up the pitch and more openings come for us. We looked pretty good at the start of the season but then totally useless in that regard and Fred looks like ap layer who could make our midfield work faster. As I said in my previous comment Herrera-Fred-Pogba in combination with Sanchez and Willian could apply some great pressure higher up the pitch and make us play much more aggressive, then we can always set up with Matic and Pogba in midfield but that makes us a bit too slow in build up even though a bit more solid defensively, while defensing in a deep block.
In other addition Jorginho is hardly Fabregas, hes a solid holding midfielder who can pass the ball but I dont believe hes even on the same level as Carrick in terms of passing, hes a bit overrated by media and fans in my view. We should get some proper winger on the right fix our fullback issues, make Pogba play well, and that should add a lot of creativity itself by adding a dynamic midfielder.. however I believe there might be one more coming, a bit more creative, in fact R. Neves would be a great fit to have a fantastic set of midfielder capable to set up different ways, but hes not coming this summer so maybe Savic, but hes a bit too slow and not DLP, what would be my choice along with Fred the red