Arsenal have been dealt an injury blow ahead of the north London derby with key defender Gabriel Magalhães ruled out "for weeks."

The 27-year-old, an ever-present this season in a Gunners side who have conceded just five Premier League goals, suffered a thigh injury on international duty with Brazil .

He sustained the problem on familiar territory, limping off during a friendly against Senegal at Arsenal's Emirates Stadium over the weekend.

Boss Mikel Arteta has now confirmed Gabriel will not be available when Tottenham visit their fierce rivals later this weekend, or for the foreseeable future.

"Gabriel, unfortunately, picked up an injury with the Brazilian national team and he's going to be out for weeks," Arteta said.

"We need to have another scan -- I think it's next Wedn

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