According to both Il Tempo and Tele Radio Stereo Smalling picked up a mild strain at his left knee. Today he will work individually and his conditions will be evaluated day by day.
Not a serious injury but the Englishman is reportedly going to skip the upcoming Serie A clash against Benevento.
Smalling had made his Roma return in the deadline day and had his official unveiling earlier this week.
"I’m very happy to be here,” he told reporters.