Former Anzhi coach Rene Meulensteen says Willian will thrive in the Premier League.
The Brazilian is wanted by Tottenham and Liverpool this week.
"I've worked with him for a short time but I really, really like him. He will be an asset for whoever's going to get him," said former Manchester United coach Meulensteen on Sky Sports News.
"If it's Spurs that's going to get him they'll get an excellent player. He's very versatile, he can play in different positions, he's a very creative player and an excellent professional with a very good personality.
"He's going to be a major trump card for Spurs if they can get the deal to go through.
"He can beat a player, he can score a goal. I thought he was an absolute delight to work with."
