Okafor is joining RBL on-loan for the remainder of the season with an option to buy for €18m.
The striker spoke to reporters before jetting off, stating: "In life you never know, maybe we'll see each other again.
"For me it was the best choice. Thanks to the Milan fans, I'm leaving a place that will forever be in my heart."
Okafor played 52 games for Milan, scoring seven goals and providing five assists.
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Milan
RB Leipzig
womeloprtz
0
My beloved AC Milan is garbage for the past ten years minimum. When you do not invest in a team, you get garbage like this team
Nahbknoty
2
All the best
weublmntz
2
Wishing u. all the best
Pakaemny
4
we love u star man wishing you all the best
middeilmsz
2
Good bye
Yeddnstyz
2
siekdhsjs
Iffy106
1
Wishing you all the best Okafor