West Ham United face losing Alex Song for a month to Cameroon's African Cup of Nations campaign.

The midfielder was not included in his country's provisional squad for the tournament, which was announced last month, but has been brought in to replace the injured Stephane Mbia.

This has forced West Ham manager Sam Allardyce to plan for life without Song for the duration of the tournament in Equatorial Guinea, which ends on February 8.

Allardyce, ahead of their FA Cup tie with Everton, said: "We have a squad that's available to play Everton less our Africa Cup of Nation players Song and Kouyate, and Sakho, who's got a back injury."