Somebody like Steven Defour, we need a guy that'll peak soon but hasn't yet, to transition Pirlo.
Have been saying that for months already, we should have signed Defour and Witsel but for some reason, Juve (and, in an extend, no other italian team) comes looking for players in Belgium.
A missed chance looking at what has left the league this summer with Defour, Lukaku, Perisic, Witsel, Courtois, Mangala and Carcela, to name the best.
Hopefully we consider getting Biglia next year, he can also be a great replacement for Pirlo, but he is non-eu.