Andrea Pirlo must not let the disappointment of Juventus's shock defeat to Benevento linger for too long, Italy manager Roberto Mancini has warned. 

The rookie Juve boss saw his team waste a chance to reduce Inter's advantage over it at the Serie A summit to seven points, with Adolfo Gaich sealing a 1-0 triumph for Filippo Inzaghi's side. 

Questions over Pirlo's leadership have already been asked and will persist, as the prospect of a 10th successive Scudetto disappears almost over the horizon.

It would take an Inter implosion and for Juventus to suddenly become infallible for the Bianconeri to catch the Nerazzurri. Neither prospect looks likely.

Mancini understands the pressure Pirlo is under and advised him to adopt a positive mindset to overcome his difficulties. 

"It is a delicate moment for him, but it is the life of all the coaches," Mancini said. "The frustration must last as little as possible, then you have to think positively knowing that this happens in football. 

"He is young and he has started [his managerial career] in a big club. He has a bit of difficulty but he has begun a path."

Mancini was speaking ahead of Italy's World Cup qualifying campaign, which kicks off at home to Northern Ireland on Thursday before visits to Bulgaria and Lithuania in Group C. 

Federico Chiesa is expected to play an important role for the Azzurri after his impressive season for Juventus. 

The 23 year-old has scored six league goals for the club since arriving on loan from Fiorentina in October, while only Alvaro Morata has made more assists (eight) than his six. 

He has also created three more chances (38) for his team-mates than any other Juve player in the top-flight this season. 

"I am happy because in the last two months he has improved a lot, but he can still improve more," Mancini said. "He still has room to improve and become a player capable of scoring plenty of goals and providing plenty of assists."

Mancini will be joined in the dugout by Daniele De Rossi, who recently joined Italy as a technical coach. 

De Rossi, who earned 117 caps for the Azzurri and won the 2006 World Cup, retired from playing in January last year after a brief stint with Boca Juniors in Argentina.

The 37 year-old made 616 appearances in a distinguished career with Roma and Mancini expects his experience to be invaluable.

"We talked about it some time ago, when he stopped and then decided to go to Boca," Mancini said. "We needed a person who could help us on the pitch, given the many commitments, and we made this decision. 

"He was an important player for the national team, a world champion. He needs to gain experience because he wants to be a coach. I think it was the right choice."