Red Bull's motorsport advisor Helmut Marko has revealed that the team expect to lose half a second per lap at Silverstone when the ban on off-throttle blown diffusers takes effect.
Speculation has been rife regarding how the ban will impact the teams, with Red Bull thought to be in danger of suffering the greatest loss.
Marko admits that the ban will cost the team but they are well prepared to deal with the changes.
"We expect to lose approximately 0.5 seconds per lap without the blown diffuser," he said.
"However, we made preparations to equalise this in terms of set-up and aero measures. We are optimistic that we will keep our performance level."
The 68-year-old is understandably annoyed at the FIA's decision to implement the ban halfway through the season.
"We would have understood if this was implemented at the end of the season like many other technical developments recently," he said.
"But to do this halfway through the season is a bit strange and not quite understandable," the Austrian added.