Robert Kubica has admitted he is worried about whether Renault is fully prepared to perform on the streets of Monaco this weekend.
The Pole, who switched to the Enstone based team following three and a half years at BMW, said he has always enjoyed a specific bodywork package for the unique street layout.
"Unfortunately we don't have a specific downforce level for here," he revealed to reporters on Wednesday.
"Normally from the past I was used to having some different wings with more downforce.
"Drag and efficiency is not so important here in Monaco, but we will be using practically the same wings as all year, so we will have to see if our downforce level is good for here," he added.
The 25-year-old is currently eighth in the drivers' championship, having finished four of the five races so far in the points.