Tuesday 14 Oktober at 10:11 : Oct.14 (GMM) Nelson Piquet's "great drive" to fourth place at Fuji Speedway does not guarantee his future at Renault, team boss Flavio Briatore insists

Before the Japanese grand prix weekend, Briatore said rookie Piquet has "not had a good season" in 2008, amid rumours that Lucas di Grassi might be slotted in alongside Fernando Alonso next year

At Fuji, however, where the Brazilian's teammate Fernando Alonso won, Piquet qualified 12th but raced on to fourth place

But Briatore insists that the 23-year-old's drive has not secured his future

"No, we will decide only at the end of the year what we are going to do," the Italian is quoted as saying by Formule 1 Race Report

Briatore explained: "A single race is not really going to change our thoughts. It seems to me only natural that he should be performing."n