Roma have confirmed that midfielder Seydou Keita faces five weeks on the sidelines with a thigh injury.
The experienced Mali international was forced off in the first half of the 5-1 win against Carpi on September 26.
The Serie A side have stated Keita is making "good progress" on the problem, but have set his recovery period at just over a month after diagnosing damage to a tendon in his right thigh.
Keita, who has made six appearances this season, is expected to miss crucial Serie A clashes away to Fiorentina and Inter, as well as Champions League games home and away against Bayer Leverkusen.
The 35-year-old is also unlikely to be fit for the derby match with Lazio on November 8.
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