Nicolo Zaniolo was taken off on a cart after suffering a serious-looking injury in front of Italy coach Roberto Mancini during Roma's 2-1 Serie A loss to Juventus on Sunday.
The 20-year-old had his head in his hands as he was withdrawn 36 minutes in at the Stadio Olimpico after injuring his left leg when Juve defender Matthijs de Ligt halted his progress with a foul on the edge of the penalty area.
Zaniolo had beaten four Juve players during a brilliant run which started near his own penalty area, but De Ligt - himself on for the injured Merih Demiral - stepped out and brought him down with a body check that earned the centre-back a caution.