Roma winger Cengiz Under will be out for at least five weeks after undergoing more tests.
Cengiz returned from international duty with Turkey nursing a thigh problem last week.
The 22-year-old was examined again on Tuesday afternoon, when it was confirmed he had injured his right hamstring.
The Giallorossi are now unlikely to have him back before the international break in October.
They have seven games between now and then, among them a Europa League clash with Cengiz’s former club Istanbul Basaksehir and a home match against Atalanta.