The Brazilian has been on the sidelines constantly since his arrival from Lyon last summer, playing just 14 League games this term.
And the capital club have confirmed that the 27-year-old has suffered a tear in his left quadricep.
An MRI scan showed the extent of the injury this afternoon after the Biancocelesti man limped out of training on Thursday. It is unclear however, how long Ederson will be missing from action.
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