Former Juventus coach Marcello Lippi believes the Serie A champions need five victories in the Champions League to regain their confidence in Europe.
Juve have won the Italian top flight for the last three seasons but were unable to progress beyond the Champions League quarter-finals in 2013 and went out at the group stage this time around.
The Turin giants made it to the semi-finals of the Europa League before losing to Benfica and Lippi, who managed Juve for eight years over two spells and lifted Europe's premier competition with the club in 1996, thinks they have work to do before they can compete with the continent's elite sides.
"Juve need three, four or five wins at international level," the Guangzhou Evergrande boss told Perform.
"They are already among the best eight to 10 best in Europe but not among the best four to five such as Barcelona, Real Madrid, Bayern Munich and Borussia Dortmund.
"They need a few important wins to gain belief and self-confidence."
Juve celebrated retaining their Serie A crown on Sunday following Roma's shock 4-1 defeat to Catania, but the 66-year-old was quick to dismiss suggestions that a lack of competition in Italy could be harming their chances in Europe.
"Before becoming important in Europe you must win in your country," Lippi added.
"In Italy, Juventus showed they are the best team and it's not true they don't have opponents as this season they faced a really strong opponent like Roma who had an extraordinary season.
"However, Juventus were even better. In the last three seasons Juventus has improved a lot after a few bad years due to several things. (Antonio) Conte was very good at creating an important squad.
"They are now aware of their strength and they need to continue their growth at international level."