Ex-Formula 1 driver Kamui Kobayashi will graduate from his test and reserve role to a full-season race seat with Toyota in this year's World Endurance Championship.
The Japanese driver, who contested three grands prix for Toyota before going on to race in F1 with Sauber and Caterham, is taking the place of the retired Alex Wurz in Toyota's line-up.
He will join Stephane Sarrazin and Mike Conway in the second of the the two all-new TS050 HYBRID LMP1s.
Toyota Motorsport GmbH president Toshio Sato said: "Kamui showed his speed and commitment in testing, so it was a relatively easy decision to select him to replace Alex."
Kobayashi, who raced in the WEC in 2013 with the factory Ferrari AF Corse GTE team, said he was "really excited to be an LMP1 race driver"
Sebastien Buemi, Anthony Davidson and Kazuki Nakajima have been retained to drive the lead TS050 HYBRID.
A replacement for Kobayashi as test and reserve driver is set to be announced on the launch of the TS050 in late March.
One candidate is believed to be Ryo Hirakawa, who Toyota has announced it will be placing in an LMP2 car with an undisclosed team in the European Le Mans Series.
The 21-year-old was a race winner in Super GT last season with the TOM'S Lexus team.
He is understood to have tested for Toyota at Aragon last month along with another candidate.
Toyota is known to be evaluating other drivers for the role this month.