The pair worked together at Borussia Dortmund and enjoyed rich success, winning titles and reaching the Champions League final together.
"Oh my God, Jurgen was such an animal! You only knew somebody like him from TV," Reus told DAZN.
"If Jurgen sits in front of you with his aura, with his aggressiveness, which he radiates even when speaking, with his size, then that is quite impressive. Even the way he talks to you - this is rarely the case in professional business.
"He pulls you under his spell and will not let you go. I left the conversation with a fluttering heart. He was definitely one of the reasons why I signed for Dortmund."