Alex Oxlade-Chamberlain of Arsenal checks on the injured Phil Jagielka of Everton.

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Everton manager Roberto Martinez has said England defender Phil Jagielka could be out for "eight or nine weeks" with a knee injury.

England international Jagielka, 33, picked up the injury in the 2-1 loss at Arsenal on Saturday and although Martinez was pleased his knee cartilage and cruciate ligament remain unaffected, the Spaniard could be without his center-back for the next two months.

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"I wouldn't expect anything longer than eight to nine weeks," Martinez said when asked about the defender's recovery timetable.

Jagielka was hurt as a result of an Alex Oxlade-Chamberlain challenge, which was described as "stupid" and "needless" by Martinez.