The Brazil international has completed his big-money move to the ambitious Russian side and will join them at their training camp in Marbella on Saturday
Anzhi coach Guus Hiddink was keen to add some fresh blood to his squad as the Dagestan outfit are gunning for the domestic title, and he had earmarked Willian as the perfect addition.
Shakhtar were keen to hold on to the attacking midfielder, but had no other option but to accept Anzhi's offer as they triggered the 24-year-old's release clause.
"There is a club willing to pay the release clause in his contract, and Willian agreed to move. There is nothing I can do," commented Shakhtar boss Mircea Lucescu earlier this week.
Willian will join Anzhi at their training camp in Marbella on Saturday, but will have to wait for his official debut until the Russian league resumes after the winter break.
Anzhi currently sit second in the table with 41 points from 19 games, trailing leaders CSKA Moscow by two points.