Hamilton's final three seasons with Mercedes, however, were pretty underwhelming, with the 39-year-old struggling to get the best out of underperforming machinery.
Two victories in 2024 meant that Hamilton did attempt to leave on a high, but he could only finish seventh in the drivers' championship, and was outperformed by team-mate George Russell in both qualifying and races.
Drivers Charles Leclerc and Carlos Sainz managed to claim five race victories between them, giving Hamilton hope that he may be given a car capable of challenging for his eighth championship title.
Now, Vasseur has revealed that Hamilton had no say over the design of Ferrari's 2025 car, revealing an inside agreement between himself and the seven-time champion.
Vasseur claims that despite himself and Hamilton constantly being in contact — something that has been the case since their GP2 days — the pair agreed to a ban on talking technical matters out of respect for Mercedes.
"We have been in constant contact since [2006]," Vasseur said via Auto Motor und Sport.
"However, in consideration of Mercedes, we had agreed for the past season that we would not discuss technical matters."