No double diffuser for Toro Rosso in Monaco, Turkey

(GMM) It will be two more races until Toro Rosso's drivers can look forward to enjoying the competitive fruits of a 'double diffuser'.

In Monaco this weekend, parent team Red Bull have rolled out the controversial rear aerodynamic concept for its RB5, which apart from a different engine is nearly identical to the Toro Rosso chassis.

But Swiss 20-year-old Sebastien Buemi, the only rookie in the Monaco field this year, said Faenza based Toro Rosso cannot expect to receive the diffuser until after the Turkish grand prix early next month.

"We're not going to have it in Istanbul," he is quoted as confirming to Germany's Auto Motor und Sport.

Buemi explained that the car modifications to accommodate the diffuser are "quite massive".