Mustafi has hung up the boots and immediately jumped into coaching.
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The 32-year-old left Spanish side Levante last summer and now has been named new Germany U17 coach.
"I have long thought about wanting to gain experience as a coach. On the one hand, it's a shame that it comes so early, because I would have liked to play football longer," Mustafi told the federation's website.
"On the other hand, I'm really looking forward to this time and to taking my first steps as a coach at the DFB. I want to pass on all the experience I gained during my time in the U15 to the U21 and of course the senior national team to the boys."