By Tom Caldon For Mailonline
Published: 11:25 BST, 22 August 2019 | Updated: 11:33 BST, 22 August 2019
The 30-year-old signed for the Bundesliga club from Chinese side Tianjin Quanjian last summer and has attracted interest from Europe's most powerful clubs throughout his career.
The Belgian broke through at Standard Liege and represented Benfica and Zenit, before his move to China, but the midfielder says he turned down an opportunity to join the biggest club in world football back in 2012.
In an interview with Goal, the Belgium international said: 'I could have joined Real Madrid when Jose Mourinho was there, but then Real signed Luka