However, Pirlo does not rank the latter among the Italian giants' chief competitors, despite them winning the competition for the last three years.
“[There are] four or five teams [in the running for the Champions League], including Juventus," he told Sky Italia.
"Meanwhile in Serie A, Juventus have shown and are proving to be a step or two steps above the others.”
Pirlo's confidence in his old side may stem from their remarkable capture of Cristiano Ronaldo from Real Madrid in the summer.
Portugal star Ronaldo is chasing his fourth successive Champions League title and has an unrivalled record in the latter stages of the competition.
And Pirlo says he has received glowing reports about the forward's professionalism from friends and former team-mates and feels that his qualities off the field are evident on it.
He continued: “Cristiano Ronaldo? My friends - his coaches, like Ancelotti - tell me he is a serious professional and a humble person.
"I'm not surprised at all, the results on the pitch are showing that.”
A set-piece specialist himself, Pirlo also shared his thoughts on Juventus' wealth of options when it comes to taking free-kicks, particularly since the arrival of Ronaldo - who he thinks will pull rank.
Pirlo added: “Ronaldo, Pjanic or Dybala? They have a great choice now because all three are very good shooters, but now Pjanic and Dybala might find it a bit more difficult because maybe the priority goes to Ronaldo."