Alberto Aquilani will miss Fiorentina's match with Siena on Wednesday after suffering a knee injury at the weekend.
The midfielder limped out of the Viola's 1-0 loss to Roma on Saturday after complaining of soreness.
And the club have today confirmed that the 28-year-old will sit out the Tuscan derby later this week with 'slight stress to the medial ligament'.
The extent of the injury has not been revealed, but the knock is expected to only keep Aquilani out for a week.
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