Kevin Strootman was injured against AC Milan on Sunday.
Roma will monitor midfielder Kevin Strootman on a "day-by-day basis'' after tests revealed a thigh injury.
The Dutchman was taken off injured in the first half of his side's 2-0 victory over 10-man AC Milan on Sunday.
And Roma announced on Wednesday that Strootman has begun a rehabilitation programme already.
A statement on the club's official website read: "On Wednesday Kevin Strootman underwent medical tests which confirmed the after-effects of bruising in his left thigh, with the area between the quadriceps and the adductor muscles showing signs of significant muscle/fascia haematoma.
"Strootman has already begun a rehabilitation programme and his condition will be monitored on a day-by-day basis.''
Meanwhile, fellow midfielder Lorenzo Pellegrini is expected to be out for up to 10 days.
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Source: espn.co.uk