AlphaTauri team boss Franz Tost had indicated for some time the plan was always to keep Tsunoda alongside Pierre Gasly - confirmation of whom was given back in June - pending sign-off from Red Bull.
Tsunoda said a few weeks ago that his future depended on "things in the background", but that he was satisfied with his displays even if the results this year have been hard to come by. Tsunoda hasn't scored a point since Spain, although AlphaTauri as a whole has found itself struggling more in the crowded midfield than it was 12 months ago.
