Just one new Renault Formula 1 engine per team for Monaco GP

The French firm intends to bring the debut of its eagerly-awaited upgraded engine forward from the Canadian GP as originally planned to next weekend's Monaco event after a successful test at Barcelona this week.

But the accelerated schedule means there will not be time to prepare enough new power unit components for all four Renault-powered drivers until Montreal.

Red Bull must therefore choose which of Daniel Ricciardo and Max Verstappen receives the new engine, a decision complicated by the team status intrigue at the squad following Verstappen's win on his RBR debut in the Spanish GP.

At Renault, Kevin Magnussen is ahead of Jolyon Palmer in the standings and tried the engine at the Barcelona test - where his team-mate made way for test driver Esteban Ocon - but managing director Cyril Abiteboul confirmed to Autosport his team is still deliberating which driver to hand the power unit to.

Autosport understands Renault does not anticipate the engine will provide a significant advantage around the tight Monte Carlo street circuit.

It had originally been concerned that while the new V6 was more powerful, it might initially lack driveability compared to the current engine until it was further refined, making it potentially disadvantageous in Monaco.