Christian Horner says Sebastian Vettel will not let his frustrations get the better of him after suffering more reliability issues in Monaco.

Having retired from the opening race of the season in Australia, Vettel was hampered by a gearbox issue in qualifying for the Spanish Grand Prix which saw him start from 15th place, and then retired from Sunday's race in Monaco with a turbo failure. The retirement came following an ERS problem in qualifying, but Horner says the growing number of setbacks will not get to the four-time world champion.

"Obviously this weekend was pretty tough on him," Horner said. "He's doing nothing wrong and he's smart enough to recognise that. Of course, like any sportsman he's going to be frustrated when things go wrong. With time to take a breath, reflect, he'll just keep working away at it.

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"That's the nature of who he is. He never gives up, he will just keep his head down and keep working harder and harder."

With Horner confirming that it was a Renault problem that forced Vettel's retirement as his turbo failed, he also said it was frustrating for the whole team, not just the driver.

"Off the line was fine, he obviously got a good start, and then literally within a lap before the restart it failed. We thought we might be able to reset it but it was actually a mechanical failure.

"It's a Renault issue ... It's obviously frustrating as it really destroyed his weekend."

Following the Monaco Grand Prix, Vettel now sits 77 points behind championship leader Nico Rosberg.