Jose Mourinho ranks as the best manager Willian has worked with and the former Brazil attacker hopes more European honours will be heading the Roma coach's way.
Willian was part of Mourinho's Chelsea squad as the Blues secured a Premier League and EFL Cup double in 2015.
The Fulham winger and Italian coach have since gone their separate ways but Willian still holds Mourinho in the highest of regards, hoping his former boss can lift yet another trophy this season.
Mourinho has guided Roma to the Europa League final, in which they face Sevilla, and Willian made it clear where his allegiances lie for that showpiece on Wednesday.
"For me, Mourinho is the best manager I've had, I always say that," he told Stats Perform. "In the way he works every day, in the way he talks, in the way he motivates.
"He is a different manager and, for me, the best I've had. As he says: 'The special one'.
"I hope that he wins this trophy because he is a manager that sometimes gives a lot of people the impression that he is arrogant or something like that.
"But on a daily basis, we see that he is a great manager. He jokes when he has to, and he hits hard when he has to.
"He's real. When you don't play well, he says it in front of you, but when you play, he says it too. He's a great manager, an amazing manager.
"He is a winning manager, and he has a chance to win another title in his career."
Victory over Sevilla would secure Mourinho's sixth European title of his managerial career, having lifted various UEFA trophies with Porto (two), Roma, Inter and Manchester United.
The most recent of those successes came last season as Roma triumphed in the inaugural Europa Conference League with a final victory over Feyenoord.
