Verratti feels Italy's players must talk up their chances of glory to help with their self-belief.
“The further forward we go, the more the pressure builds, but we need the right enthusiasm to keep playing our football, as it's the only way to achieve something extraordinary," Verratti told the official UEFA website.
“If you don't set certain objectives, it becomes difficult to achieve them. Sometimes a tiny detail can make the difference in these games and we must try to give our all, to think big, then we'll see what happens."
The midfielder played his first game of the tournament for the 1-0 win over Wales.
“It was an emotional game for me and I am happy to be back doing what I love the most, playing football, especially in a very important competition for us.
“I was always in contact with Roberto Mancini and I must thank him for waiting, allowing me to be here."