The company’s performance in 2020 is now expected to be better than original expectations, although it added that the outlook was still uncertain “with significant Covid-19 challenges across our markets.” More details will be given at the half-year point, it said.
Narasimhan added that the key uncertainty was whether people would keep shopping at the same levels now they had filled their cupboards.
He stressed that the difficulties of producing such high volumes of product was likely to continue “for some time.”
Narasimhan paid tribute to his staff around the world who had managed "heroic" feats to increase production.
The company was now geared up to produce more hand sanitiser in May than it did in the entirety of 2019.
Measures have included cutting the number of versions of the same product to allow factory lines to run continuously.
"You see all sorts of heroics in the supply chain," he said. "If an ingredient for a product is not available, we will airfreight it. That happened in Wuhan, where we flew out a key ingredient from Europe which was not available to our factory there due to the lockdown.
One component in China we had to source from Vietnam then took it by road to China."
Overheads increased as the company took measures to protect workers in factories around the world. That included refitting canteens and communal areas and even in some cases providing sleeping accommodation.
The company has given millions of pounds in donations and free products to frontline workers across the world, including free Dettol care packages to NHS workers.
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The virus will impact on some elements of his restructuring plans unveiled in February, he admitted.