Lahm ended his international career last summer and has played over 400 games for Bayern Munich.
“Once again, it is most clear to me that I am going to finish [my career] in 2018,” Lahm told Sport Bild magazine.
“It’s good for me to be able to prepare for a definite date.
“With the national team I prepared myself for my farewell, that is why I am still 100 per cent behind the decision and have never regretted it.”
