Chelsea have confirmed that they have agreed terms with Willian and his club Anzhi Makhachkala over a transfer.
The Brazilian will still face a work permit hearing on Wednesday before the deal can be completed.
Assuming the permit is granted, it will put an end to a topsy-turvy transfer saga involving three Premier League clubs.
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Liverpoool had an interest in the player before Tottenham outbid them.
But Spurs were thwarted in turn by Chelsea who stole in at the 11th hour to swoop for the ex-Shakhtar Donetsk player after he had completed his Tottenham medical.