ABU DHABI, United Arab Emirates - Nico Rosberg will be driving in his last race for Formula One team Williams at this weekend's Abu Dhabi Grand Prix.

Rosberg confirmed his decision Thursday without saying which team he would join in 2010. Brawn GP or McLaren are thought to be the major contenders for the German's signature, with much to hinge on Mercedes' decision on its future ownership stakes in those two teams.

"It is my last race with Williams," Rosberg said. "Four or five years with the only team I have worked with -- it's going to be quite strange to leave.

"They have really supported my career, so it's a 'thank you' for them."

Rosberg said he was eager to join a team that had the potential to win races next season -- something he thought was beyond Williams.

"I would like to try to get into a car where there would be a very good chance of winning," Rosberg said. "There is no reason they (Williams) can't be as good next year as this year and remain close to the top, but I am not sure they can win races."

Brawn GP driver Rubens Barrichello has held talks with Williams about joining in 2010 and is considered the most likely contender to replace Rosberg, raising the possibility of a straight swap between the pair.

Should the 24-year-old Rosberg move to McLaren, he would reunite with Lewis Hamilton. The pair drove together for a McLaren Mercedes junior karting team, but the German denied he had any ongoing contractual link to Mercedes which had prompted a 2010 shift.

"I have no ties," Rosberg said.

Rosberg, the son of former F1 champion Keke Rosberg, began his Formula One career in 2006 with Williams. He did not win a race with the team, but achieved two podium finishes.