The 20-year-old is currently on loan at Fulham until the end of the season.
“We’re good friends, he’s a great guy and will become a great player,” De Rossi told uefa.com. “He’s very strong, a little like Luca Toni.”
“He has fantastic technical skills and he’s physically very fit and he’s still only 20 years old,” he added. “He needs to play at Fulham and he’ll soon become a great striker.”