I don't think Sanchez or Verratti are joining us, at least not this summer. I also believe that we can keep hold of Dybala, potentially for the duration of his career (a few deep runs in the CL, perhaps a CL title, and increased revenue should do the trick).
However, I do have a feeling we will be buying a few promising young players both this summer, and the following one. I'd still keep an eye out for Tielemans, and acquire both Tolisso and Keita Balde. Milinkovic Savic is an interesting prospect, and if Berardi wants to come back, he's definitely ours, but he'll cost 40 or 45 million, not 25 (that option expired last summer).
A mercato of Tolisso, Berardi, Balde, and a couple of young prospects, while finally getting rid of Zaza, Coman, and Lemina (unfortunately) wouldn't constitute a bad mercato by any stretch of the imagination.
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We'll be stacked in attack (bonafide stat padder and exciting young talent), have that hard working young engine - potentially top class - who brings quality and quantity to our midfield.
In 2018, we can bring in Goretzka, Caldara, and maybe someone else. These are exciting times. As long as we retain our best players, we will be serious contenders both at home, and in Europe, for the next decade. I really hope we can start a winning cycle in Europe a la Barcelona. Up until 2007, they'd only ever won 1 CL title, and now they have 5!