Juan is confident man-for-man Roma will match Inter tonight.
"Inter are still as strong as last season, even without Mario Balotelli," warned the defender.
"It's true we must try not to concede, but we too have many champions in attack and can certainly hurt the Nerazzurri."
On Adriano's much-anticipated Roma debut, Juan added: "Adriano looks good to me and we are all waiting for him to find his form. I've known him since his days at Flamengo, but it's still difficult to say when we'll see the 'real' Adriano."