The defender penned a new long-term deal this morning.
Gunners sporting director Edu said: "We are so happy to have completed a new long-term contract with Ben. Since Ben joined us, his contribution and commitment have been of such high quality. Our supporters love him, we love him and we look forward to enjoying Ben's performances with us for years to come."
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Manager Mikel Arteta added: "It's great news that Ben is committing his future to the club. Ben is a key player for us, a top professional with a winning mentality, and one of the guys who leads by example every day.
"Ben's ability, determination and positive attitude are so important, but he is also a great character and human being. We all look forward to continue working with Ben in the coming years."