There had been reports of the switch following Rafael Marquez’ departure from New York last week.
Andy Roxburgh, the club’s sporting director, said: “Juninho is a world-class player who our global sporting director, Gerard Houllier, and I have known and admired for many years.
“Aside from being a top dead-ball specialist and a tremendous talent, Juninho is a fantastic professional both on and off the field.
“He is in great physical shape, and we think he can make a positive impact for us in 2013.”
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.