Materazzi out for a month

ROME - Inter Milan defender Marco Materazzi has had minor arthroscopic surgery on his right knee, the Serie A leaders said on their website on Friday.

The 36-year-old is likely to be out for a month, adding to coach Jose Mourinho's problems in defence with Davide Santon injured and Cristian Chivu recovering from a fractured skull.

Midfielders Sulley Muntari and Esteban Cambiasso are also sidelined for Saturday's home match against bottom side Siena.

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