Kiwi Brendon Hartley will drive for Toro Rosso fulltime in Formula 1 in 2018 with Red Bull finally confirming the deal overnight.
Hartley made his Formula 1 debut at the US Grand Prix in Austin in October and has competed in Mexico and Brazil since.
The 28-year-old has been linked with a permanent drive for weeks but it was only confirmed by the team this morning that he and French teammate Pierre Gasly will be the team's drivers next season.
"We're really happy to have Pierre and Brendon confirmed so early by Red Bull as our drivers for 2018", said team principal Franz Tost.
"During this last part of the year they've shown that they're ready for Formula 1, getting to grips with the car quickly, showing good performances and always demonstrating to be prepared for the challenge.