Two former Ferrari drivers have questioned the team's supposed resurgence, with the Italian squad so far winless in 2016.
After surpassing their own expectations with three wins in 2015, many expected Ferrari to challenge for the title this season. While they have been front runners in terms of pace, the team has so far failed to reach the top step of the podium.
"It may happen quickly, or it may not happen at all," he said. "What I do know is that I worked at Ferrari for many years and I was in exactly the same situation as Vettel is now - sometimes I won, but mostly I did not."
"There is always a lot of pressure from above," The Austrian added. "Jean Todt managed to lead a team with Michael Schumacher and Rory Byrne and Ross Brawn that shielded this pressure from top to bottom and so it was a very successful time. But it seems to me as it Ferrari is back where it was with me: Italian confusion."
Alain Prost, who replaced Berger at Ferrari in 1990 echoed the Austrian's sentiments, saying that the team needs stability to move forward.
"I can sum it up in one sentence: real stability at Ferrari is very difficult," The Frenchman told Minute-Auto.fr. "We see that when there is this nervousness, this is not a team that manages it in the best way,"
"This is a team that needs confidence to move forward and become again the steamroller that it was in the time of Todt, Brawn and Schumacher," he added.
Bahrain International Circuit - Winter testing