Robert Kubica has revealed more details about why he decided against racing in the World Endurance Championship this year.
The 33-year-old Pole had two tests with the Manor LMP2 squad at Aragon earlier this year. He said the sessions in the British team's G60-LT-P1 "went quite well."
However, he subsequently decided against pursuing the option.
Speaking to Motorsport.com this week, Kubica explained exactly why he had decided against racing in WEC alongside his role as reserve and development driver at Williams F1.
"Mainly it was due to the time limitation," he said. "And because in the end I am quite busy with Williams.
"It was possible to do it," he added. "But it would mean that I would have had eight days at home in the space of five months.
"It was more the time, the amount of time that I could dedicate to this project. And I arrived to the point that after which I decided not to do it."
He dismissed suggestions that the decision was based on concerns about his physical health and stamina.
Kubica raced in Formula 1 until 2010 before suffering a major rallying crash which left him with life-changing injuries to his right arm.
"I think it would have been too much," he said. "It is better to concentrate on doing one thing properly than two things which might become risky if you don't do them properly.
"It is a shame I am not in a position to do Le Mans. But in the end I decided to concentrate on Williams."
Kubica said that his decision should not be taken as a reflection on the Manor squad. "The performance was not an issue," he said.
Last year, Kubica pulled out of a potential WEC drive for the ByKolles team after a terrible pre-season test.
"I had different situation with Kolles than with Manor," he stated. "In the end we agreed with Manor that I will do the test and I would decide after the test."
Gallery: The beautiful wives and girlfriends of F1 drivers
Keep up to date with all the F1 news via Facebook and Twitter
Audi’s 2026 Formula 1 project is already under the microscope, but racing director Allan McNish…
Max Verstappen will launch his long-awaited Nürburgring 24 Hours debut from the second row of…
Cadillac F1’s arrival on the grid in 2026 has been anything but quiet, and according…
Alpine has strengthened its growing 2026 Formula 1 project by officially welcoming former FIA head…
The 65th running of the Indy 500 held back in 1981 saw an interesting and…
Ralf Schumacher has opened up about the emotional strain he experienced during his F1 career,…