Jenson Button believes that Lewis Hamilton will soon rekindle the speed that will 'shock you all.'
Hamilton has received criticism recently after Mercedes team-mate Nico Rosberg has constantly outperformed him during qualifying.
But Button, a former team-mate of Hamilton at McLaren, believes it's only a matter of time before the Englishman regains his true speed.
"For Lewis, it is the same as it is for all of us - if he does not have a car balance that suits him, then it is not easy," he told German magazine Auto Motor Und Sport.
"And, of course, Nico is fast. But Lewis has not lost his speed. It is still there. He will come back and then he will shock you all."
Rosberg has achieved three poles during qualifying compared to Hamilton's one.
Despite Hamilton's recent troubles before races, he beat Rosberg during qualifying for the first time in four races at the Canadian Grand Prix.
Hamilton has also achieved 20 more championship points than his German team-mate even though he's often started behind him.
Button added: "You have to be fair. He has at least scored significantly more points than Nico. Lewis is incredibly fast."
Hamilton has failed to finish higher than third this season with Mercedes only victory coming thanks to Rosberg at Monaco. However, after seven races, he has only finished below fifth once.
He currently sits fourth in the driver championship but is 55 points off leader Sebastian Vettel who has three wins to his name.
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