Nico Rosberg has committed his future to Mercedes after signing a new "multi-year" contract with the team.

While it was rumoured that a new deal had been agreed much earlier in the season, Mercedes announced on Wednesday that the contract was only signed on 14 July. The announcement - which comes ahead of this weekend's German Grand Prix - extends Rosberg's stay with the team he joined when it returned to F1 in 2010 and he said he hopes to fight for championships over the coming seasons.

"I am very proud to drive the Formula One Silver Arrow of the modern era," Rosberg said. "As a German, the heritage of Mercedes-Benz is very special for me, and I am proud to be able to represent the best car brand around the world. It has been a difficult road to get to where we are now - but everybody kept believing and, thanks to the fantastic support from Mercedes-Benz, we are now leading the way in F1.

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"There has been big progress during the past year, building up our structure, management and capability for the future. 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."

Mercedes executive director (technical) Toto Wolff said Rosberg's contribution to the team's current level of dominance should not be underestimated.

"Nico has been part of the Silver Arrows project since day one and he has a big stake in the development of the team since 2010," Wolff said. "His speed, commitment and focus have all helped to give clear direction and to drive the team forward.

"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. 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."

Rosberg has taken six victories for Mercedes and currently leads the drivers' championship by four points from team-mate Lewis Hamilton.