Petkovic comes in this summer for his first taste of Serie A football, after agreeing to replace outgoing Edy Reja in the capital hotset.
"We've just played a good season but now we must focus on recharging our batteries and again trying to make ourselves protagonists in what I consider to be the most difficult League in the world," Ledesma began on Lazio Style Radio.
"I have not met Petkovic yet, but from the images I have seen he seems to be a demanding Coach, but well-informed. We will give our all and make ourselves useful to the project in hand.
"I have no fear of losing my place in the starting line-up, I've always been accustomed to thinking of the group as a whole."