We all know the importance of balance in a football team.
We have number 10s, Fabregas would therefore be signed to be a number 8 and that means supporting both defence and attack.
I'm not sure Fabregas has the work rate nor defensive qualities to do that to the level we would like. And I think Juan Mata is creative enough as the number 10.
We just need to sign a good number 8 who has the aggression, the work rate, that dynamic box to box player who can balance his defensive qualities with the ability to pass the ball, to create chances and to support the offensive players by joining in the attack and even score goals.
I would sooner target Vidal with a £50m bid although I doubt he would get him. A player like Strootman would be fine too, although of a lesser quality he can perform this function well however his injury problems are a worry. There must be others though!