Jenson Button is remaining coy on rumours that Nico Rosberg will be his 2010 Brawn GP team-mate.

With Rubens Barrichello on his way to Williams and Rosberg having left the Grove-based team, rumours claim the German is heading to Brawn GP.

Button, though, is refusing to confirm whether the reports are true.

Asked by the official F1 website if he'll be seeing Rosberg more often next season, perhaps as a team-mate, Button said: "How many races will we have next season? 19? Then I will see him 19 times."

The reigning F1 World Champion also didn't give the game away when asked if himself and Rosberg would make good team-mates.

"A team-mate must be two things. He must put you under pressure and he must be willing to bring the team forward together," said the Brit.

"That was the case this year with Rubens (Barrichello) and me. What was also important was that we both learnt a lot together when we both had a really bad car."

Team-mate rumours are not the only stories making the rounds regarding Brawn GP. There is also speculation that Mercedes, the team's engine supplier, could buy into the team.

Once again, though, Button wouldn't confirm or deny.

"That's a question for Ross (Brawn) to answer. We don't know what will happen next season. All I know is that we should cherish the moment."