Renault boss Cyril Abiteboul has labelled team's double retirement from points-paying positions at the Bahrain Grand Prix unacceptable.
Nico Hulkenberg and Daniel Ricciardo were running in the top 10 when their cars both failed at almost the exact same time with just three laps remaining. Both issues were deemed to have been engine related.
Hulkenberg had also suffered engine issues which meant he qualified at the rear end of the grid, in 17th, despite the team clearly having pace to challenge at the front of the midfield pack.