Sven-Goran Eriksson heaped praise on "perfectionist" Roberto Mancini as the Italy head coach continues to oversee the stunning transformation of the Azzurri at Euro 2020.

Italy will face Belgium in the quarter-finals on Friday after setting a new national record by extending their unbeaten streak to 31 games thanks to a last-16 triumph over Austria.

A proud football country but a national team on their knees after failing to qualify for Russia 2018, their first World Cup absence since 1958, Mancini is the mastermind behind a drastic recovery following his appointment more than three years ago.

Banishing the nightmares of Gian Piero Ventura's dismal tenure, Italy have only conceded more than once in one of their past 18 matches at major tournaments, dating back to the beginning of Euro 2012.

They have conceded just 13 goals across these matches (eight clean sheets) with the only game where they did concede more than once coming in the 2012 European Championship final against Spain (a 4-0 defeat).

As a whole country unites behind 1968 European champions Italy, former Roma, Sampdoria, Lazio, England and Manchester City boss Eriksson hailed Mancini.

"Italy are playing very, very well," Eriksson, who coached Mancini at Sampdoria and Lazio in Serie A, told Stats Perform. "In the first two, or the first three games, they were the team that played the best football of all. Why? I don't know. However, they have many good players without any doubt, playing in top clubs, important ones.

"And then they have Mancini, Roberto. Clearly, he's been a manager for a long time now, he's been in Italy, he's been in England, in Russia I think, in Turkey as well. However, I knew, 25 years ago, that Mancini would have become a great manager. Because I've had him as a player for eight-nine years, and back then he already was like a manager.

"He was everything at Sampdoria: warehouse worker, cook, everything. And manager as well. Because he lives for football and it's always been like that for him. He is very curious – 'Why are we doing this during training?', 'Why don't we do this, or that?'. He would always come to me with questions about our training. And he was always talking about football.

"He's doing a great job, I understand it and I am very, very happy for him because he is also, in his job and I think in his life, a perfectionist. There are no half measures with Mancini. He is all or nothing. When he goes to training, he is all. When he changes club, like when he came with me from Sampdoria to Lazio, he was the same at Lazio. He was giving everything, and he wanted to win at any cost. He is a winning mind, a very winning one."

Eriksson added: "He is also a very generous man. For example, he would invite all the players and the whole coaching staff to the restaurant, once a week or every two weeks.

"Fantastic, fish-based, from Genova. And he would always pay, everything. He's a great man. I think very highly of him, and I am happy that he is doing very well."

Italy have reached the quarter-finals of the European Championship for a fourth consecutive tournament. Each of those previous three appearances at this stage have been decided by a penalty shoot-out, with the Italians eliminated by Spain in 2008 and Germany in 2016 while progressing past England in 2012.

Indeed, that accounts for three of a total of five European Championship penalty shoot-outs Italy have participated in – more than any other nation prior to the 2020 edition.

Italy have won all four of their matches at Euro 2020. They have never won five consecutive games at European Championship finals, while only twice previously have they won five or more in a row at any major tournament (World Cup and Euros), winning seven in a row at the World Cup from 1934 to 1938 and five in succession at the World Cup in 1990.

"I don't see a weak spot. Mancini, as perfectionist as he is, always wants to play good football. And maybe this is a weak spot," Eriksson said. "However, it's not actually. I like seeing the football played by Italy, because they attack, they play the ball pushing forward, they don't play like tic-tac, tic-tac. They get the ball, they steal the ball and then go. They lose the ball, they fall back, they defend, aggressive. This is a kind of football that is very nice to see.

"It's clear that Barcelona, Spain, play good football. However, I don't like it that much, because there are a thousand passes before they decide to attack for real. I know that Mancini is not like that. Mancini wants to attack. I hope that this style gets to the end."