Mercedes' rivals have acknowledged the gap to the dominant championship leaders will not be easily overcome.
Reports on Sunday suggested Red Bull was quickly catching up with the silver clad team in the development race, after Sebastian Vettel finished within striking distance of the second-placed Nico Rosberg in Malaysia.
But Red Bull's Christian Horner said after Sepang: "It's a big gap. They have plenty up their sleeve."
Ferrari's Fernando Alonso, meanwhile, acknowledged the Italian team is not yet even in a position to beat the second force of 2014, Red Bull.
"For Bahrain we can't expect any miracles, because we are practicing again in just five days and so no teams are...
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