The Brazil international impressed in his first season in England last term, and has been linked with a move to AC Milan and Roma.
Despite this, the South American has put pen to paper on a new deal that will keep him in North London for a further five years.
“The club is delighted to announce that Sandro has signed a new five-year contract which runs until 2016,” an announcement on the side’s official website read.
Sandro is currently recovering from a knee injury that he picked up whilst on international duty with Brazil during the Copa America.
Meanwhile, Chelsea boss Andre Villas Boas has stated that a January move for Spurs playmaker Luka Modric is unlikely.
The Croatia international was the subject of at least three bids from the Stamford Bridge outfit over the summer, with Spurs turning down a deadline day offer of £40million for the midfielder; the Chelsea boss believes their interest may end there.
“No I don’t think so. The market is closed and I won’t speculate what happens in January,” he told Sky Sports News when asked about Modric’s future.