Vasseur, the former boss of the Alfa Romeo F1 team and Sauber CEO, started work at the helm of the Scuderia in January of this year following the winter resignation of the under-fire Mattia Binotto.
But ahead of a home race for Ferrari this weekend at Imola, the team currently occupies fourth in the constructors' championship. It led rival Red Bull going into last year's Emilia Romagna Grand Prix.
Unreliability, strategic errors and de-tuning the turbos for the latter half of 2022 led to a performance drop-off, while the new SF-23 has so far struggled for race pace and suffers from spikier handling.
But this fall down the order has not sparked any knee-jerk changes from Vasseur, with Leclerc saying the Frenchman will only now heavily intervene, having initially used his time in charge to take stock.
Asked to give an opinion on Vasseur's leadership style and any changes made, Leclerc said: "Well, I think he's just starting this process now.
"Until now, he was basically trying to analyse the situation as quickly as possible in order to do the best changes possible for the future.
"So, I think the big part of the job will be done from now on. So we will see.
"Obviously, I speak a lot with Fred and I know what his middle- and long-term plans for the team are. I'm completely behind him and I trust him fully.
Source: Autosport