Thierry Henry has heaped praise on Donyell Malen, a player he coached at Arsenal a few years ago. The talented Dutch international starred for Borussia Dortmund in the Champions League last night and scored a brilliant goal against his old club PSV Eindhoven. Malen caught up with Henry after the game. Arsenal legend Thierry Henry says people doubted Donyell MalenDonyell Malen joined Arsenal as a teenager back in the summer of 2015 from Ajax. The Dutch forward was one of the best players in the Gunners academy back then. He was fantastic at youth level and caught the eye of everyone who watched…