Mertesacker admits it is exciting that he is stepping into the unknown and insists he is prepared for whatever comes at him.
"It is exciting. It is a new phase in my life and I am really looking forward to it, but I also feel nervous. It is like before the first day at school," Mertesacker told German news agency DPA.
"Now I have a new challenge in a new country, a new style of play and a new language and I am ready for it."