PLEASE DON'T!!!
He is about as useful as a chocolate fireman! I follow the german league quite closely, and he hasn't developed one tiny bit (except for his biceps) since he joined Bayern from Basel, despite the fact that he got to train and learn from some of the best players in the world in his position, namely Robben and Ribery AND having one of the best managers in the world in Guardiola. Add to all this, the fact that he could barely get in the worst Inter team in 30 years! He has the football brain of a chicken. If he spent half as much time on his football as he apparently does pumping iron, he might have been a decent player. Chadli is twice the player!
But Chadli plays for Spurs already, so he's brick. Better to get new players we know little to nothing about.