It's logical.
I wouldn't go as far as selling 6 or 7 from the players that are currently in Juve (without counting the guys on loan) in order to buy 2 players of better quality, but we can still have 2 players for every position and improve the squad with quality (so we'll have both quality and quantity).
If we have 10 mil eur left in our budget, then we can still improve the team a lot.
We have 5 CMs in our team. We need 4 of them. Sell, lets say, Poulsen and Tiago, add 5m and buy, lets say, Xabi Alonso.
We have 2 Rbs +Salihamidzic and Mellberg who can play RB. Sell Zebina and Grygera, add 5 mil and buy a good RB for 12-13m eur.
It's easier to say than to do, i know. Some of these players earn a lot on wages and they might not even want to leave Juve. They might prefer to sit on the bench and get the huge salary nevertheless.