Zetsche admits the real problem is with their chassis not their engine.
Jan.16 (GMM) Dieter Zetsche, the chairman of the German marque's parent Daimler, says Mercedes must be pushing for the world championship by 2014.
Admitting that the appointments of Lewis Hamilton and Niki Lauda, and the departure of Norbert Haug, were because of Mercedes' lack of recent success, he also acknowledged that the silver team will not be in a title-winning position this year.
"For Mercedes those expectations must be that we are up there at every race competing for victory."
He said the fact Mercedes only won a single Grand Prix between 2010 and 2012 led to "changes" for this season, including a "new driver, new chairman and more to come".
"The real problem lay with the chassis and we are working on that," admitted Zetsche.
"The coming season will probably not allow us to show the full effect of the changes, but in 2014 we will have a good shot at the championship, especially with the new engine rules," he added.