Michael Schumacher's future in Formula 1 remains uncertain after the German was replaced by Lewis Hamilton at Mercedes.
The seven-time champion, who returned to grand prix racing in 2010 following a three-year absence from the sport, said he was focusing on the next races with the team.
The German, 43, has been rumoured to be in talks with Sauber, but said he was uncommitted on his future plans.
"I have had three nice years with the team which unfortunately did not go as well as we all would have wanted on the sporting side," Schumacher said.
"I wish Lewis well and for the team to achieve the success we worked so hard for in the build-up. I would like to thank the team for their trust and all the guys for their unconditional commitment. I will now concentrate on the next races."
Mercedes team boss Ross Brawn thanked Schumacher for his contribution during his three-year stint at the Brackley-based squad.
"On behalf of Mercedes, I would first of all like to thank Michael Schumacher for the important contribution he has made to the growth of our team over the past three seasons," said Brawn.
"His energy and commitment have never wavered, even when results have not matched our own expectations, and we are determined to finish the 2012 season together on a high. As always, it has been a pleasure to work with Michael."