Anzhi signed the Brazilian from Shakhtar Donetsk in January, beating off competition from leading western European teams.
Tkachenko told sports.ru: “Willian is a man who is in a category of stars, which comes immediately after Cristiano [Ronaldo] and [Lionel] Messi.
“To bring him here was our goal, our dream. It is very easy from the middle of the table to become a good team. But when you are at the top it is more difficult.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.