The Swiss defender is joining Nurnberg on a free transfer.
"It makes me sad because I've had a great time here. I've been here for three-and-a-half years and I've enjoyed it a lot. I'm sad it's come to an end but I'm looking forward to a new challenge," he told arsenal.com.
"I had some great experiences like making my debut in the Capital One Cup against Coventry, playing against Olympiacos in the Champions League in Olympiacos and the NextGen Series. I've learned a lot here and I'll try to take that to Germany."