Max Verstappen has said that he is feeling better after his illness in Malaysia.
The Dutchman admitted only after winning at Sepang that he struggled physically throughout the weekend.
"I was not feeling well at the start of the race," said the Red Bull driver. "Then it got worse and worse."
Verstappen, 20, duly sprayed his champagne on the podium but admits that he did not celebrate at all after that.
"I also took it a bit easy in the next few days. Now I feel good again," he said at Suzuka.
Verstappen admitted that he is now looking ahead to 2018, and a potential title challenge if Red Bull can come into the season with a strong car straight away.
"We will not go into another season so much behind," he said.
"Adrian Newey is now taking full care of Formula 1 again, so from the point of view of next year, everything should be in order."
Verstappen is sixth in the driver rankings heading into the Japanese Grand Prix.
