Liverpool midfielder Mohamed Sissoko is expected to be sidelined for the next three months.
The Mali international suffered a shoulder injury playing against Birmingham in the Carling Cup.
A statement on the Liverpool website, liverpoolfc.tv, read: "Unfortunately Momo will require surgery which is scheduled to take place next week.
"It is anticipated he will be out of action for three months."
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The injury will mean Steven Gerrard reverting back to centre midfield for Sunday's game against Arsenal.
