Madrid - Spanish champions Real Madrid announced on Monday evening that Mahamadou Diarra will be out of action for between six and nine months.
The Mali midfielder was operated on in Madrid on Monday morning, for a complicated break in the external cartliage of his right knee, an injury he originally sustained playing for Mali against Chad in October.
Diarra, 27, is Real's second lon-term knee injury victim, after Ruud Van Nistelrooy.
The club's other absentees at the moment are Pepe, Gabriel Heinze, Ruben de la Red and Wesley Sneijder.