Kallenius has now said that the two Mercedes drivers have been performing at the highest level for a while now and there is no point in tinkering with the line-up.
The 32-year-old German driver joined Ferrari in 2015 to replace Fernando Alonso, but has not added to his world titles at Red Bull from 2010-13.
Sebastian Vettel, a four-time world champion is out of contract at the end of 2020.
Hamilton again showed he is untouchable in the rain, producing a brilliant last lap to take pole position for the Hungarian Grand Prix.
Vettel trails championship leader Hamilton by 14 points going into Sunday's ninth of 21 races.
SINGAPORE: Lewis Hamilton took the lead in the Formula One drivers' championship by winning the Singapore Grand Prix on Sunday, leapfrogging teammate Nico Rosberg who had to retire early with a gear-selection failure. Hamilton led comfortably
MONTMELO, Spain: Lewis Hamilton earned his fourth pole position of the Formula One season Saturday as Mercedes was again in a class of its own at the Spanish Grand Prix, while four-time champion Sebastian Vettel
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