Roma continued their pre-season training camp in Austria with a 6-0 win over SC Liezen, in which Destro scored a hat-trick.
Zeman declared: "Am I satisfied with the decision to sell Fabio Borini and bring in Destro? Yes, we made this choice based on technique and I think Destro is a more technical player than Borini.
"I already have a basic idea of my starting XI. I have a squad that covers every role with two players, then it depends on their fitness levels and my level of madness on which ones I use."