We should sell both him and Matri while bringing back Gabbiadini, and switch to 4-3-3.
Personally, I prefer the 433 too. But there a couple of considerations to make here. Pirlo's gradual decline and the type of player we bring in upfront. If you're saying this keeping Vucinic-Llorente-Pepe in mind., then it may not be in our best interests over the course of a long season.
Also, unlike most people here I'm against selling Quag and Matri for the sake of it. If they're going to be replaced by the likes of Osvaldo, we won't be movi forward at all. Infact adjusting unnecessarily without making the leap in quality. It may not even be worth our while to lose both for a Sanchez level player, who while I rate, is not a game changer. Yes, we could sell one to raise some cash, but Id like to hold on to at least one of them because theyve seemed like viable options off the bench. Unless we are getting a game changer like Suarez, I think it would be very foolish to lose both Quag and Matri.