The multiple World Champion, who has endured a tough challenge since his return to F1 three years ago, will now assess his options.
"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," the German 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."
