Nico Rosberg will be the only man in charge of carrying out driving duties for the Mercedes team during the upcoming tyre test in Bahrain.
The German squad had been expected to use both its racing drivers during the three days of action.
The team said of Monday that Lewis Hamilton will not attend the test however due to training commitments, tweeting: "For those asking, @LewisHamilton has already begun his high-altitude winter training programme, which is why he won't be in Bahrain."
The test kicks off tomorrow and finishes on Thursday.
Red Bull, Ferrari and Toro Rosso will be the other teams testing in Bahrain.
Bahrain test line-up: Team Drivers Red Bull Sebastien Buemi Mercedes Nico Rosberg Ferrari Pedro de la Rosa/Jules Bianchi Toro Rosso Jean-Eric Vergne/Daniil Kvyat