That is because Sauber’s owner is closely linked with Marcus Ericsson, while the other seat will go to Antonio Giovinazzi or Charles Leclerc as a result of the new Ferrari engine deal.
Wehrlein is supported by Mercedes, but there appears to be no room at a Mercedes-powered team or elsewhere for the German for 2018.
“I have scored all five points,” he told Bild, “and in qualifying it is 8:2 for me against Ericsson. What more can I do?”
Bild and Blick (Switzerland) newspapers said a return to the German touring car series DTM, where Wehrlein won the title in 2015, or Formula E are his most likely 2018 alternatives.