Grosjean got Friday practice guarantee in his Haas F1 contract

Haas recently announced that it would field Ferrari protege Antonio Giovinazzi in seven grand prix practice sessions in the second half of the 2017 F1 season, taking Kevin Magnussen's car on six occasions and Grosjean's just once.

When paired with Pastor Maldonado at Lotus in 2014/15, Grosjean was always the driver who made way for a Friday tester - handing his car to Charles Pic and Esteban Ocon for one-off runs in '14 but then sitting out 13 practice one sessions for Jolyon Palmer the following year.

Grosjean says he made sure his Haas contract ensured he would not have to give his car up, though he agreed to step out for one Friday session despite not being obliged to.

"It was decided in 2015 when I signed my new contract," Grosjean explained.

"Learning from the past!

"I can't tell you what it says, but basically after I left Lotus, I didn't want to leave my car anymore.

"I think for the team as well it is good to have a certain consistency."

Magnussen negotiated his deal himself, and assumed he was on the same terms regarding Friday practice running as Grosjean.

"It was in the contract that I was offered," said Magnussen.

"And I didn't know the other contract was like that! I assumed it would be the same, so I said, 'No worries'.

"It's not a big deal.

"Romain had a bad experience with his previous team where they took all his Fridays, and for sure he was a lot harder on that point than I was.

"They offered it to him, they offered us the same contract, but he clamped down on Fridays, because he had a bad experience, and I didn't worry.

"It's not perfect, it's not the best way, but I'm not too worried about it."

Grosjean said the cost of giving up Friday morning sessions varied depending how difficult a car is to set up.

"It depends where you are with the baseline," he said.

"In 2015 for example, I left quite a lot of my FP1 for Palmer, and as the baseline of the car was pretty good, it wasn't too much of a problem.

"When the car is a bit more tricky to drive or you cannot find your baseline, then it is not ideal.

"But as a team sometimes these are things you have to do.

"It's not perfect in terms of performance-related things. But it may bring us some other advantages."