Honda chief Yusuke Hasegawa wants Sauber to confirm its 2018 plans as soon as possible, with doubt still hanging over their agreed partnership.
During the Russian Grand Prix weekend Sauber confirmed a deal to take Honda engines for 2018. Former team boss Monisha Kaltenborn was the architect behind the deal, but her departure has led to speculation the deal is off.
Frederic Vasseur, who replaced Kaltenborn, has put the Honda issue top of his list of priorities but the situation remains uncertain. Honda says if cannot afford to wait too long to hear that decision.
When asked when Honda needed to know if the deal was going ahead from a planning point of view, Hasegawa told Racer: "Now.