But fresh speculation over whether they will keep their seats cast a shadow over their achievements at Interlagos.
Williams are understood to be considering appointing a driver who is able to inject funding into the team.
When asked again to clarify the situation, Barrichello, who joined the team from Brawn at the end of last season, said: "I don't know what the situation is with the team.
"[These rumours] are new to me. Even today we talked about next year's car.
"I tell you it is unbelievable how things are. All I can say is that I hope Nico stays.
"I believe I have one of the strongest team-mates, especially because of his youth. He's truly good.
"I like his attitude. He does not have a lot of experience but the way he translates comments are in the right direction. It shows he has been a champion before."
Hulkenberg, 23, entered Formula 1 this season after winning the feeder GP2 Series crown in emphatic fashion in 2009. Pastor Maldonado, from Venezuela, succeeded him as champion this year in his fourth year in the formula.
Highlights - Brazilian Grand Prix qualifying
Hulkenberg has not been re-signed for 2011 and with Maldonado testing for Williams in the close season young driver event in Abu Dhabi, his place remains under threat.
Williams engineering director Patrick Head, a co-owner of the team, cut short further discussions on their 2011 driver line-up in Brazil.
"We are not making any statements until after the season," said Head. "And if we have anything nasty to say we'll let [chief executive] Adam Parr say it."
However, Head also went on to praise Hulkenberg after he took the team's first pole since 2005.
"He's progressed a lot during the year [although] he was at a good level right when he started," he said.
"Formula 1 throws up significantly bigger challenges than any of the other formulae.
"You can feel that he's very much more in control of the cockpit now, in terms of when to be quick and when to leave a margin. He's got quite a mature head on his shoulders."
Hulkenberg said: "All I can do is do my best and hope that is good enough for the team to keep me on."
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.