Timo Glock has rubbished conspiracy theories suggesting that he deliberately handed the world championship to Lewis Hamilton.

Glock's action gave Hamilton the fifth place the Briton needed to clinch the title on the final lap of the Brazilian grand prix on Sunday but said he could not keep his grip after being unable to change to wet tyres.

"I actually told the team on the radio that I wanted to come into the pits to change on to wet tyres but they answered that the pits were blocked and there was no chance to get in," he said. "We couldn't do anything about it and had to stay out on dry tyres. As it worked out, pitting would have made no sense because we would have lost even more time."

The Toyotas of Glock and Jarno Trulli were the only point-scoring cars to remain on dry tyres as light rain started to fall. The rain left Glock and the front-row starter Trulli grappling to keep their cars on the track as their lap times dropped off by more than 16 seconds on the final lap.

That was not enough to convince many pundits who bombarded internet message boards with conspiracy theories as to why Ferrari's Felipe Massa had been denied the drivers' championship.

Some Spanish newspapers carried comments from readers suggesting the climax had been fixed. One read: "Question: who are Hamilton's friends in the paddock? Answer: Rosberg and Glock. Strange what happened, hey?

In Britain comments included: "Glock stopped for Hamilton because they are buddies from GP2. Glock needs to be banned from FIA sanctioned events for life. Unbelievable."

Glock, 26, who has just finished his rookie season, answered his critics by pointing out: "It was only the last lap where we lost the time."

Glock was seen trying to talk to Hamilton as he passed the McLaren in Parc Fermé at the end of the race, which fuelled the fires of conspiracy, but the new champion was too preoccupied trying to replace his steering wheel to reply. Glock had been on course to finish fourth going into the final lap and dropped to sixth when passed by Sebastian Vettel and Hamilton.

"I had no chance to resist the guys on wet tyres because they were just so much quicker," he explained. "I had to stay off the racing line because there was so much tyre rubber on it, which becomes incredibly slippery in the wet. I don't know how anyone can think that I just pulled over.

"I was just driving my line where it was safest with dry tyres and, if Lewis had not overtaken me in that corner, he would have overtaken me on the following straight because there was no way I could go flat out on the dry tyres.

"I had the car in fourth gear to minimise the wheel spin and was just concentrating on bringing it home. In that situation you cannot think about the championship. I was driving my own race and I wasn't looking out for Lewis or anybody else. I was too busy trying to keep my car on the track."

As for the championship outcome, Glock added: "It was decided at the last corner of the last lap and that's racing. But in reality it was decided by the points Lewis and Felipe scored over 18 races. In the end both were a bit unlucky at different stages of the year and that, too, is racing. I don't think I decided the championship. It was a racing situation."

An FIA spokeman said that the governing body had no reason to believe that anything untoward took place in one of the most dramatic pieces of sporting theatre ever witnessed.