Arsenal have signed Sunderland goalkeeper Mart Poom on loan.The Estonian will provide cover for Gunners number one Jens Lehmann, who is banned from the first two Champions League games of the season, and joins on loan until the end of the year with a view to a season-long deal.The 33-year-old dropped down the pecking order at the Stadium of Light behind Kelvin Davis, Joe Murphy and Ben Alnwick.
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