Red Bull owner Dietrich Mateschitz is adamant that losing some key staff to rival teams was not the cause of this week's Jerez woes.
Red Bull had a dismal first pre-season test, managing just 21 laps as they were blighted by engine issues and an overheating RB10.
The team's problems came in the wake of Red Bull losing several key staff.
Chief aerodynamicist Peter Prodromou is now with McLaren while head of vehicle dynamics Mark Ellis and chief simulation engineer Giles Wood both switched to Mercedes.
Mateschitz, though, denies their departures have affected the team.
"The current problems arose from the engine side and not from our team, which still has the high-level know-how it needs," he told Autosport.
The Austrian added that Red Bull expected to have some troubles in Jerez given the huge changes to the regulations that include the introduction of a V6 turbo engine.
"These teething problems came as no big surprise," said the 69-year-old.
"We had expected a difficult first test and now the problems have to be fixed for the Bahrain test."
He added: "However, the truth arrives when we are all on the grid in Melbourne.
"It is up to us and Renault to solve the problems and get ready.
"There is no reason to be worried yet."