The Giallorossi now sit in second-place after reviving their fortunes under coach Claudio Ranieri.
"We need a month to understand whether we are the anti-Inter," said Juan.
"The Nerazzurri are very strong. Mourinho is a great Coach. But everyone has weak points. We also have to keep winning because Milan and Napoli are behind us.
"It's difficult to say where Inter can lose points. Sure, the games against Sampdoria, Genoa and Palermo are not simple, but we also have to play against Milan and Napoli therefore we shouldn't distract ourselves.
"Having a match against Inter at the Olimpico and knowing that up until now we have never been able to play at full strength is an advantage. For example, if Toni was playing, Totti had problems and vice verse. Soon we'll have more alternatives.
"Perhaps the best Roma has yet to have been seen."