Fernando Alonso and McLaren insist Renault's recent reliability issues are not a concern for 2018.
McLaren will switch from Honda power to Renault next year in a move the team hopes will result in a return to podiums and victories. Renault engines have won races in with Red Bull this year, but at recent rounds have also suffered a significant amount of reliability issues.
Toro Rosso has suffered the most with problems in recent races, but all six Renault supplied cars have exceeded their power unit quotas on multiple occasions this year.
Asked if the problems are a concern ahead of 2018, especially as drivers will be limited to three power units per season rather than four next year, Alonso said: "No, not really.