Inter have confirmed that Radja Nainggolan has suffered a thigh strain and said he would be "evaluated in the coming days".
Depending on the severity of the injury, Nainggolan is likely to miss Inter's forthcoming friendly matches against Zenit and Chelsea, and possibly subsequent friendlies as well.
Nainggolan suffered the injury in a pre-season game against FC Sion, with teammate Yann Karamoh also forced off as Inter endured a miserable afternoon, losing 2-0 in Switzerland.
“Radja Nainggolan and Yann Karamoh both underwent medical exmainations at the Istituto Clinico Humanitas in Rozzano,” the Nerazzurri confirmed on Friday.