Willian has touched down in London to finalise his move to White Hart Lane pending a successful medical, according to Eurosport.com.
Spurs have busy in the transfer market this summer, welcoming Roberto Soldado and Paulinho for club record fees. However, should the £30m deal for Willian go ahead, the north London club's transfer record will be broken for a third time this window.
Andre Villas-Boas has already spent £60m on bolstering his squad, but the 35-year-old insists he could make further acquisitions before the transfer window closes.
"We will see some new players in defence and attack," said the Spurs manager.
Tottenham have been linked with moves for Roma midfielder Erik Lamela and Real Madrid full-back Fabio Coentrao, but Villas-Boas refused to reveal any plans regarding possible deals for the pair.
"They have not signed for Spurs. Both of them are great, great players, but I cannot extend myself," he said.
In the wake of their lucrative summer spending, Tottenham have parted ways with Scott Parker, Tom Huddlestone, Clint Dempsey and Steven Caulker and sent Jake Livermore on loan.
Gareth Bale could also be heading for the exit door as Real Madrid step up their summer-long pursuit of the Welshman. Villas-Boas has denied that a deal for the winger has been agreed, but he is mindful of the chaos that will unfold should he leave this summer.
"Ideally we want to keep everyone to make us stronger – that is the ultimate objective of the club," the Portuguese said.
"In the end, anything can happen. We are dragging ourselves into the last weeks of transfer activity and it can become very, very frantic."
Bale, who was unable to feature in Tottenham's 1-0 victory over top-flight new boys Crystal Palace last Sunday, is unlikely to feature for Spurs until late August due to a foot injury according to The Independent.
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