A viral video has given fans an inside view into the Italian dressing room ahead of the final at Wembley, and showed the seriously cool manager speaking to his men with a smile, telling them: "We are the masters of your own fate".
When former Manchester City boss Mancini took charge of Italy in 2018, the Azzurri were in turmoil.
They failed to qualify for the World Cup for the first time since 1958 under Gian Piero Ventura, which is a virtual tragedy for the four-time world champions.
Mancini, however, has changed everything - and it's easy to see why judging by his team talk ahead of the Euro 2020 final.
Prior the penalty shootout win, the Italy boss gave a classy and inspirational speech to rouse up his side for the Wembley showpiece.
You can have a look at a clip of the speech, below…
After naming the starting XI, Mancini turns to the players with a wry smile on his face, and says: "So, I have nothing to say.
"You know what you are. And we are not here by chance.
"We are the masters of our fate. Not the referee, not the opponents, nobody else. Okay?
"You know what you have to do."
It certainly did the job for Italy, who battled back from Luke Shaw's early goal to take the game to extra-time, and taking the lead from their boss as they kept cool heads in the shoot-out to win.
It was a heartbreaking result for England, who came so far in the tournament and gave the nation so much to celebrate.
And one man who really wasn't happy about the result, and Mancini's success, was former England and Manchester City defender Wayne Bridge, who admitted his 'hate' for the ex-City manager.
"It really hurt me because I hate Mancini, everyone knows I have no love for him," said Bridge, speaking on bettingexpert's The Big Stage.
"What he did was good, which hurts to stay. Not only was my family cheering for England, they were cheering that Mancini was losing, so it hurt us even more.
"I never really got him as a manager. All credit to what he did at Manchester City when winning the league, so City fans will love him, but if you look at the players and the squad that he had, that's what won it, not him as a manager.
"I fell out with him. I was there for a few months and we got on well but I didn't enjoy training at all.
"We did team shape against mannequins and as a full-back we're told 'you're going to pass it to him or to him, if you pass it there then run that way, if you pass it to him go that way,' you'd have two options and that was it and playing against mannequins isn't football.
"[Craig] Bellamy was trying to ask a question 'what happens if this happens in a game', and Mancini would say 'shut up, be quiet' and in the end he sent him home and he wouldn't have him back at training.
"As a manager, I really don't get it."