The Cameroon international's free transfer is set to be confirmed later this afternoon.
The 24-year-old German-born player, who can operate as a midfielder as well as at centre-back and has 27 Cameroon caps, came through Schalke's youth set-up.
He made his Bundesliga debut at the age of 18, playing as a midfielder and scoring in a 1-1 draw with Bayern Munich in November 2009, and has over 200 senior club appearances to his name.