The 'tough' Liam Lawson subject Isack Hadjar will not approach

Liam Lawson's brief Red Bull tenure is not a subject Isack Hadjar feels comfortable broaching with his Racing Bulls team-mate.

The New Zealander was sent back to the joint-team's second squad after only two disappointing rounds alongside Max Verstappen, with Yuki Tsunoda promoted in his place.

It took Lawson a while to re-acclimatise to life at the Faenza outfit, with Hadjar consistently out-performing him across the eight rounds they have spent together.

With Tsunoda also struggling to adapt to the RB21, as Lawson did, it has vaulted the French driver into prime position to partner Verstappen in Milton Keynes next season.

However, Hadjar claims he does not have any understanding as to why both the Japanese driver and Lawson encountered such difficulties at Red Bull, revealing it is not something he has discussed with the 23-year-old since he returned to Racing Bulls.

"It's not something we talk about because... I mean, I don't want to ask him about it, because it's a tough subject to talk about," Hadjar told media including RacingNews365.

"I don't really know and, yeah, we didn't talk much about it."

Hadjar on where he can still make progress

Hadjar is widely considered the stand-out rookie driver in F1 this season, having collected 21 points across the opening 10 rounds and thus far avoided being knocked out of qualifying in Q1.

Nonetheless, he maintains there are things he still needs time to better understand.

"I think I haven't experienced a tricky car enough," the 20-year-old explained.

"So far my car has been very consistent and not the hardest to drive. So I didn't have weekends where the car felt terrible.

"I don't have experience on trying to bring a car from zero to high in a single weekend, so I think maybe on the technical aspect as well, I can still make progress understanding what an F1 car needs to go faster and so on.

"I think raw speed, you have it or not, but there's more outside of it."