Hahnemann, 35, signed a new deal a year ago taking him to the end of this season, with a one-year option if he is still a regular.
Hammond said: "Marcus and I agreed a new deal less than a year ago, which covers last season and the whole of the current campaign. That contract also contains an automatic one-year extension up to the summer of 2009 if Marcus continues to perform regularly in the Premier League, and this is a target he is well towards."
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