Rubens Barrichello insists that Kimi Raikkonen would not be able to do a better job for Williams than he has if the Finn were to replace him next season.
The 2007 world champion has held talks with the team about a possible Formula 1 comeback next year, but Barrichello is determined to remain in the sport with Williams.
Barrichello also warned that it would be a false economy for the team to take a less experienced pay driver in his place as they would be more prone to errors.
"I don't believe that anybody else, including Kimi, can offer anything more than I do," said Barrichello. "They already know what I can offer.
"Young drivers can have more money, but they can also have bad things happen on the first lap and all of that money goes away with crashes. In the end, Williams know how much enthusiasm I still have for this even though we are driving a car that is not competitive.
"They know how much I have put into this team and how much I want to get into next year. We just need to wait and see what they have to say at some point, which I hope is soon."
The 39-year-old admitted that he would be willing to look into the possibility of raising some sponsorship if that was what was required to keep his drive.
However, he stressed that Williams has not discussed this with him and that, as far as he is concerned, it is not a condition of him staying on.
"If the team said that is a requirement, then I would work on it," said Barrichello. "But I did not understand from the team that this is what is required."
Barrichello confirmed that he is also looking into opportunities at other teams, with Renault believed to be among those considering him as a potential signing should Robert Kubica not be fit to start the 2012 season.
But the Brazilian stressed that he is only willing to drive for a competitive team and that he will not take any seat to remain in F1 at any cost.
"Sure, some other teams," he said when asked by AUTOSPORT if he had spoken with other outfits.
"I would love to drive a quick car and there are certain teams that would have that next year."