World championship leader Nico Rosberg has signed a long-term deal with Mercedes, the German Formula One team confirmed on Wednesday.
Rosberg, who joined Mercedes in 2010, signed a "multi-year contract extension" on Monday, according to the team.
Earlier on Wednesday, Germany's Bild newspaper reported the deal to be worth 55 million euros ($A82.5 million) until 2017.
"I am very proud to drive the Formula One Silver Arrow of the modern era," the 29-year-old Rosberg said in a statement.
"We have an awesome team and I am confident that we have the right people in place at every level. I'm looking forward to the next years together, when we will keep pushing to win even more races - and hopefully championships," he added.
Rosberg has six race victories with Mercedes and, although yet to win a world title, he leads this season's championship standings by four points from British teammate Lewis Hamilton ahead of Sunday's German Grand Prix at Hockenheim.
"With his performances in 2014, Nico has demonstrated to the outside world what we knew already in the team: that he is one of the very top drivers in Formula One," Mercedes boss Toto Wolff said.
"This new contract brings us important stability and continuity for the future and I am delighted to be able to make the announcement in time for the home race of Mercedes-Benz and Nico in Hockenheim."
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