On debut, Calzona oversaw Napoli's 1-1 draw with Barcelona in the first-leg of their Champions League round 16 tie last night.
Juan Jesus said afterwards: "The coach had little time, but he is very prepared, he was already taking care of the defensive phase and from that little what he has done, we have already seen something about the way he comes out from deep with the ball and some of the ideas he is transmitting to us.
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"We will come away with a draw, but there is the return leg and we will go there to win."
He also said: "I don't like to say that we are unlucky, the ball hasn't been coming in for a while, there were difficulties in the 1st quarter but we were always facing Barcelona with great players.
"We could have won it, we're waiting for the second leg. It will always be 50-50, no one should be afraid, they are a great team, but so are we."