Definitely over-paid, imho, for Fabregas. He's good, but not a monster ingame, so that amount would be overkill. You have really good CMs, and an awesome ACM [Kagawa is worth 64 million in the second season for me, despite starting like only half the number of games], and a developing Januzaj..
But if you're able to successfully fit him in your game, good for you, I guess..