Sebastian Vettel was left feeling 'quite helpless' after he was sidelined by a turbo problem in the early stages of the Monaco Grand Prix.

Vettel made a good start and jumped Red Bull team-mate, Daniel Ricciardo to run third early on. However, he was soon forced out after having lost power and slipped down the order, and in the end completed just five laps around the streets of the Principality before having to park his Red Bull RB10.

The German was initially quite vocal on the team radio, before reining himself in. It was his second DNF of the season, as he also retired in Australia, the opening event.

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"It's disappointing. I had a good start and then we lost boost pressure from the turbo, so I had no power and had to retire," said the four-time F1 world champion. "The team did everything they could. I felt quite helpless in the car, so I was asking for an answer of what we could do, but there wasn't anything at that stage."

"We fixed some problems on Saturday with the ERS, but some more came today with the turbo, but we will move forwards and it will be good for us soon," he added.

Red Bull team principal Christian Horner meanwhile apologised to his lead driver, while Renault's Thierry Salvi has promised the French manufacturer will look into the causes in a bid to 'fully understand' want went wrong with the Power Unit.

"We have to apologise to Sebastian for an issue with his power unit. It's frustrating that, after making a good start, his race came to a very premature end," Horner noted.

Salvi added: "Seb had a disaster today as he suffered a reliability failure from the power unit. We tried different settings to fix the problem but ultimately we had to retire."

"We will look into the causes tonight now and in the coming days to fully understand what happened here," he concluded.