The 28-year-old finished on the podium in Canada
Asked if needing to replace the highly rated Briton with controversial Mexican rookie Sergio Perez has contributed to McLaren’s problems, team boss Whitmarsh answered: “I don’t think so.
“Lewis is a great driver and a good asset and we have not got him. But I think both our drivers are doing a good job,” he is quoted by Sun newspaper.
Hamilton moved to Mercedes over the winter, but at recent races he has looked glum as teammate Nico Rosberg scored a hat-trick of poles and won in Monaco.
The 28-year-old Briton, however, had a better weekend than Rosberg in Canada, finishing on the podium.
He is quoted in the Independent newspaper as saying he was “determined to regain everyone’s confidence in me”.
But Mercedes insists it never lost faith in its new recruit.
“I don’t have that feeling we lack confidence in him,” team director and co-owner Toto Wolff said.
“I think we are going to see great races from Lewis. I’ve no doubt.”