"We will not interfere. This is very important," the three-time world champion said. "We didn't interfere from the beginning, so why should we now?"
Rosberg shouldn't face any of the gearbox problems that forced his withdrawal from the British Grand Prix on lap 29 for his first non-fish of the season.
Mercedes technical chief Paddy Lowe said the team's main focus following Silverstone had been to identify the problem "and to make sure there is no recurrence moving forwards."
Lowe said, "a lot of work has been put into rectifying the issue and we head to Hockenheim with a remedy in place."
Mercedes has also worked on other upgrades evaluated in the previous race and Lowe said he expected "both improved performance and a more robust package from a reliability perspective."
RED BULL STUTTERING
Red Bull's encouraging 1-3 finish at the Canadian Grand Prix was followed by 8-DNF in Austria and then 3-5 at Silverstone. The team has won all eight F1 drivers' and team's championships across 2010 to 2013 but Mercedes appears in a class of its own this year.
It's been a sobering campaign for Sebastian Vettel, the all-conquering champion of the past four seasons, who has failed to finish a third of the races so far.
"We have tried lots of stuff to improve, but (Mercedes) are doing the same thing," the German said. "We are waiting for bigger steps to happen to close the gap even more which at the end of the season we can judge a lot better - then we know what we can do over the winter."
Vettel, who won on home soil for the first time last year, is aiming for a top three finish on Sunday.