On Thursday, he will be heading for Indonesia and the start of the club's pre-season tour of the Far East.
"It will be good to be back in training and I feel fit," he said. "This is a very important time of the year.
"This will be my first tour with Arsenal and I'm really looking forward to it. I hope Arsenal can have a good pre-season and, hopefully, all of us can be injury free. It's good to have Jack Wilshere back but we need all our players to be available.
"Last season was a good season for me. I scored a lot of goals and made a lot of assists so I was happy.
"I came from a small team like Cologne so it wasn't easy but, hopefully, this year will be better."