Answer
Thorgan Hazard never played a match for Chelsea. Despite signing for the club in 2012, he was immediately loaned out to Zulte Waregem in Belgium. After returning to Chelsea in 2014, he was again sent on loan, this time to Borussia Mönchengladbach in Germany. In 2015, his loan move to Mönchengladbach was made permanent, and he has remained with the German club ever since.