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Toro Rosso and Sauber have confirmed which days each their drivers will be taking part in during this week's official pre-season test.
The test takes place at the Circuit de Barcelona-Catalunya and starts on Monday February 26. All teams will be present for a total four-days of on-track activity.
Toro Rosso's 2018 driver line-up consisting of Brendon Hartley and Pierre Gasly will be present on alternating days.
Hartley gets the honour of giving the STR13 its first shakedown. He'll be behind the wheel on Monday and Wednesday, with Gasly getting his chance on Tuesday and Thursday.
The team hadn't yet officially unveiled its 2018 challenger. That will happen on Monday morning in the pit lane at Barcelona, before the track opens for the start of testing.
In contrast, Sauber has already held its official car launch and shown off the new Alfa Romeo livery it will be sporting for the new season.
Marcus Ericsson remains with the team for a fourth season. He will be trying out his new company car on Monday and Wednesday.
His new rookie team mate, Formula 2 champion Charles Leclerc, will be in charge of things on Tuesday and Thursday.
Yet to announce their plans for this week's test are Mercedes, Ferrari and Renault.
There will be full coverage of the pre-season tests right here on F1i.
| Monday - Feb 26 | Tuesday - Feb 27 | Wednesday - Feb 28 | Thursday - Mar 1 |
| Mercedes | |||
| TBC | TBC | TBC | TBC |
| Ferrari | |||
| TBC | TBC | TBC | TBC |
| Red Bull | |||
| Daniel Ricciardo | Max Verstappen | Daniel Ricciardo | Max Verstappen |
| Force India | |||
| Nikita Mazepin | Esteban Ocon | Sergio Perez | Nicholas Latifi |
| Williams | |||
| Lance Stroll/ Sergey Sirotkin |
Sergey Sirotkin/ Robert Kubica |
Lance Stroll/ Robert Kubica |
Sergey Sirotkin/ Lance Stroll |
| Renault | |||
| TBC | TBC | TBC | TBC |
| Toro Rosso | |||
| Brendon Hartley | Pierre Gasly | Brendon Hartley | Pierre Gasly |
| Haas | |||
| Romain Grosjean | Kevin Magnussen | Romain Grosjean | Kevin Magnussen |
| McLaren | |||
| Fernando Alonso | Stoffel Vandoorne | Fernando Alonso | Stoffel Vandoorne |
| Sauber | |||
| Marcus Ericsson | Charles Leclerc | Marcus Ericsson | Charles Leclerc |
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